An ice core is a narrow cylinder with a surprisingly large reading list: snow, dust, chemical traces, layers and the history of what happened to them. This guide teaches 100 useful English ice core analysis vocabulary words, with meanings, natural collocations and original examples. You will learn to describe a sample, follow a laboratory explanation and distinguish a measurement from a reconstruction of the past.
Switzerland makes that distinction wonderfully concrete. Research reported by the Paul Scherrer Institute on 26 January 2024 compared cores taken in 2018 and 2020 at Corbassière glacier, Grand Combin, in Valais. Meltwater had damaged the chemical record. Ice could remain while some of its evidence became unreliable: the archive had not simply vanished; parts of its message had been disturbed.
Use one ten-word group at a time. Read the example, cover the definition, then explain what the word helps a researcher decide. The worked exercise asks why equal lengths of core need not represent equal lengths of time. “Top 100” means a curated learning selection, not a measured frequency ranking. The vocabulary is mainly general scientific English, contextualised through Swiss research rather than presented as uniquely Swiss terminology.
Choose the question you want to answer
There is no prize for reaching word 100 while forgetting what a proxy is. Pick a route, solve its small problem and return for the next layer of language.
First find the weak link in your explanation
Try this before studying: “A deeper sample must be older by exactly the same number of years for each metre.” Which part is unsafe? Deeper often indicates older in an undisturbed sequence, but a fixed depth-to-time conversion does not follow. Accumulation, compaction, ice movement and missing or disturbed layers matter. If your explanation stops at “deeper means older”, begin with groups 2 and 7 rather than memorising more instrument names.
Next distinguish three things: the material, the measurement and the claim. Ice is material. A measured ion concentration is a result. A statement about earlier atmospheric conditions is an interpretation that needs dating, preservation checks and supporting knowledge. Saying these three aloud often reveals the missing step more efficiently than rereading an entire chapter.
A useful diagnosis is specific: “I can recognise concentration, but I cannot explain why melting can change a concentration profile.” Repair that link with a sketch of layers and moving water. Then use a new example without the sketch. All classroom scenes and numerical exercises below are invented for learning; they are not unpublished observations from a Swiss glacier. This is a reading and communication guide, not instructions for drilling, entering glaciers or handling laboratory chemicals.
Contents: find a useful word group
Material, layers and chemical evidence: groups 1–5
1–10: The material before the measurement
21–30: When the archive changes after snowfall
Measurement, time and trustworthy interpretation: groups 6–10
51–60: From sample to defensible measurement
71–80: Reading the graph without inventing its story
Worked example · Practice · Speaking and writing · Questions · Sources
Begin with ordinary-looking nouns. Their scientific meanings are more exact than the words “snowy stuff”, useful though that phrase may be when finding your gloves.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 1 | ice core | A cylinder of ice extracted for study; the term names the sample, not the drilling hole. | analyse an ice core | The exhibition diagram showed how an ice core becomes a sequence of labelled laboratory samples. |
| 2 | glacier | A persistent mass of land ice that moves under its own weight. | an Alpine glacier | The class located the glacier in Valais before discussing the evidence obtained from it. |
| 3 | snowpack | The accumulated layers of snow covering an area at a particular time. | a seasonal snowpack | A diagram of the snowpack helped Lea distinguish the newest snowfall from older buried layers. |
| 4 | firn | Snow surviving at least one melt season and altered into dense grains, intermediate between fresh snow and glacier ice. | firn compaction | The student shaded the firn separately so that the diagram did not jump straight from snow to solid ice. |
| 5 | grain | An individual crystal or particle; specify whether you mean an ice grain or another material. | an ice grain | The enlarged illustration showed an ice grain beside the boundary separating it from its neighbour. |
| 6 | compaction | The process of packing material more closely together, reducing its volume. | progressive compaction | More overlying snow can contribute to compaction, so layer thickness is not a simple clock. |
| 7 | density | Mass per unit volume; it differs from the total mass of a sample. | measure ice density | Two equally sized blocks in the classroom model had different density because their masses differed. |
| 8 | porosity | The proportion of a material occupied by pores or empty spaces. | decreasing porosity | The drawing represented decreasing porosity with fewer connected spaces between the grains. |
| 9 | overburden | Material lying above a particular level and exerting weight on it; a technical noun. | overburden pressure | In the simplified cross-section, overburden meant everything resting above the marked layer. |
| 10 | grain boundary | The interface between neighbouring crystals; not simply a visible seasonal layer. | a grain boundary | The researcher’s diagram placed some impurities near a grain boundary rather than evenly throughout a crystal. |
The National Snow and Ice Data Center explanation provides the broad snow-to-ice background. Its polar examples are not a description of every Alpine site. Keep the general process separate from the preservation history of a particular Swiss core.
A useful description gives position and direction before offering an explanation. “There is a stripe down there” becomes much more informative with a depth and a defined reference point.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 11 | layer | A distinguishable band of material; it is not automatically a complete year. | identify a layer | The worksheet labelled one layer without assuming that its boundaries marked January and December. |
| 12 | stratigraphy | The arrangement and succession of layers, studied to understand their relationships. | describe the stratigraphy | The team compared the stratigraphy with the chemical profile before assigning dates. |
| 13 | depth | Distance below a stated surface or reference level. | sample depth | Nora wrote the sample depth beside the result instead of leaving the vertical axis unexplained. |
| 14 | thickness | The distance between opposite boundaries of a layer or object. | layer thickness | The teacher asked whether changing layer thickness could affect a simple depth-to-age calculation. |
| 15 | accumulation | The addition of snow or ice; specify the period and measure used. | snow accumulation | The report discussed snow accumulation without treating every winter as identical. |
| 16 | ablation | Loss of snow or ice through processes such as melting or sublimation. | surface ablation | A surface ablation diagram showed material leaving the glacier rather than being buried. |
| 17 | deposition | The arrival and settling of material onto a surface. | atmospheric deposition | The class used deposition to describe dust reaching snow, not dust forming inside the laboratory. |
| 18 | erosion | Removal of material by agents such as wind, water or moving ice. | wind erosion | The hypothetical missing layer prompted a question about erosion, not an instant explanation. |
| 19 | hiatus | A gap in a sequence or record; formal scientific usage. | a depositional hiatus | The age model allowed a hiatus instead of forcing every interval into an unbroken timeline. |
| 20 | orientation | The recorded direction or alignment of an object or sample. | record core orientation | The catalogue preserved orientation information so later readers could interpret the sample consistently. |
Say “a layer interpreted as annual” when that interpretation still needs evidence. Say “an annual layer” when the dating work supports it. Small wording choices show whether you understand the status of a claim.
The snow does not sign a promise to remain untouched. These words explain why preservation is a question rather than an assumption.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 21 | melting | The change from solid to liquid; distinct from evaporation or sublimation. | surface melting | The diagram showed melting at the surface before tracing where the resulting water travelled. |
| 22 | meltwater | Liquid water produced by melting snow or ice. | meltwater movement | The class followed meltwater through the drawing with a blue pencil. |
| 23 | percolation | Movement of liquid through connected spaces in a porous material. | meltwater percolation | Percolation gave the student a mechanism linking surface melt to changes deeper in the core. |
| 24 | refreezing | Freezing of water that was previously frozen and then melted. | a refreezing layer | A dense band in the imagined section was labelled as a possible refreezing layer pending further evidence. |
| 25 | infiltration | Entry of liquid into a material; entry and subsequent movement are related but distinct. | water infiltration | The caption separated water infiltration into snow from its later movement between layers. |
| 26 | redistribution | A change in how material is spread among locations. | chemical redistribution | Chemical redistribution could blur a peak even if the substance had not completely left the core. |
| 27 | leaching | Removal of soluble substances by liquid passing through a material. | ion leaching | The explanation used ion leaching to describe one possible loss mechanism, not a change in the original snowfall. |
| 28 | retention | The holding or preservation of material within a system. | impurity retention | The discussion compared impurity retention with the movement of dissolved substances. |
| 29 | alteration | A change from an earlier state; the word alone does not identify its cause. | post-depositional alteration | The student added a mechanism after writing alteration, because a label was not yet an explanation. |
| 30 | preservation | The maintenance of material or information through time. | record preservation | Good record preservation mattered more than the impressive length of the displayed ice cylinder. |
PSI’s multiphase snow chemistry work treats snow as a dynamic material. Use “can” for a possible process and describe the evidence needed to show that it happened in a particular sample.
A chemical name tells you what was measured. It does not, by itself, tell you where the material came from or what the weather was doing.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 31 | impurity | A substance present within another material; in ice research, it can carry valuable information. | trace impurities | What sounded like unwanted dirt became useful evidence when the class discussed trace impurities. |
| 32 | solute | A substance dissolved in a liquid; not a synonym for every particle. | a dissolved solute | The learner distinguished a solute in meltwater from an undissolved speck of dust. |
| 33 | ion | An atom or group of atoms carrying an electrical charge. | measure ion concentrations | The report identified the ion before comparing its concentrations across samples. |
| 34 | concentration | The amount of a substance relative to a specified amount of sample. | a concentration profile | A concentration profile needs units as well as a line that rises and falls. |
| 35 | particle | A small discrete piece of material, whose composition may need further analysis. | an insoluble particle | The image showed a particle, but its appearance alone did not establish its source. |
| 36 | aerosol | A suspension of small liquid droplets or solid particles in a gas; often discussed in atmospheric science. | atmospheric aerosols | The class connected atmospheric aerosols with deposition onto snow without calling all aerosols gases. |
| 37 | sulfate | An ion containing sulfur and oxygen; in reports, its source needs independent assessment. | sulfate concentration | A sulfate increase prompted the learners to ask which additional evidence might distinguish possible sources. |
| 38 | nitrate | An ion containing nitrogen and oxygen; not interchangeable with all nitrogen compounds. | nitrate measurements | The caption kept nitrate measurements separate from a general statement about nitrogen. |
| 39 | ammonium | A positively charged nitrogen-containing ion; different from ammonia. | ammonium ions | The student corrected ammonia to ammonium after checking which chemical species the table reported. |
| 40 | black carbon | Light-absorbing carbonaceous material produced by incomplete combustion; not every dark particle. | black carbon analysis | The museum exercise asked why a dark speck could not be identified as black carbon by colour alone. |
PSI’s ice-chemistry research description identifies several complementary measurements, including ions, isotopes and black carbon. Their usefulness depends on the question and the condition of the archive, not on one universally superior substance.
These are connection words: they connect a measured material with a possible origin or process. The connection must be argued, not smuggled into the definition.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 41 | isotope | A form of an element with a particular neutron number. | a stable isotope | The explanation called it an isotope of oxygen, not a different chemical element. |
| 42 | stable isotope | An isotope that does not undergo radioactive decay; “stable” does not mean its measured ratio never varies. | stable isotope analysis | Stable isotope analysis supplied a different kind of information from the ion measurements. |
| 43 | isotope ratio | The abundance of one isotope relative to another, with the comparison explicitly defined. | water isotope ratios | The learner checked how the water isotope ratios were expressed before comparing two graphs. |
| 44 | tracer | A substance or property used to follow an origin, pathway or process. | an atmospheric tracer | The researcher needed a justified link between the tracer and the process being investigated. |
| 45 | source attribution | The assessment of where a measured substance originated. | uncertain source attribution | The discussion kept source attribution tentative because several origins remained plausible. |
| 46 | transport | Movement of material from one place to another. | long-range atmospheric transport | The example distinguished atmospheric transport from delivery of the ice sample to a laboratory. |
| 47 | diffusion | Net spreading caused by molecular motion, often down a concentration gradient. | molecular diffusion | A separate arrow represented diffusion so it was not confused with flowing meltwater. |
| 48 | adsorption | Attachment of substances to a surface; distinguish it from absorption into a material. | surface adsorption | The caption used adsorption for attachment at a surface rather than movement into the bulk material. |
| 49 | solubility | The extent to which a substance can dissolve under specified conditions. | differences in solubility | Differences in solubility helped the learner see why not every impurity would behave identically. |
| 50 | fractionation | A process that changes the relative proportions of isotopes or chemical components. | isotopic fractionation | The student explained fractionation as a change in proportions, not the creation of a new element. |
In everyday English, “source” can mean a book. Here it may mean the origin of deposited material. State which meaning you intend. This is a useful habit in both scientific reports and source-based English assignments.
Laboratory vocabulary is not a list of impressive machines. Its most useful words explain what was measured and how a misleading result might be detected.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 51 | sample | A selected portion of material used for investigation. | a labelled sample | Each sample in the classroom catalogue had an identifier linking it to a depth interval. |
| 52 | subsample | A smaller portion taken from an existing sample. | a core subsample | The subsample retained a link to the original section rather than acquiring an unexplained new label. |
| 53 | contamination | Unintended introduction of material that can affect a result. | sample contamination | Dust on a work surface was considered a possible contamination source in the invented laboratory scenario. |
| 54 | blank | A control used to assess contributions from procedures, containers or reagents; technical laboratory sense. | a procedural blank | The procedural blank helped distinguish a sample signal from material introduced during analysis. |
| 55 | calibration | Establishing a measurement relationship using known references. | instrument calibration | The instrument calibration gave meaning to the response rather than merely making the graph look tidy. |
| 56 | reference material | Material with characterised properties used to support measurement quality. | a certified reference material | The worksheet asked what property of the reference material was known and why it mattered. |
| 57 | detection limit | A stated threshold for distinguishing a signal from background under defined conditions. | below the detection limit | The result below the detection limit was not rewritten as proof that the substance was absent. |
| 58 | precision | The closeness of measurement results to one another under stated conditions. | measurement precision | Repeated results showed good precision, although the class still needed to consider systematic error. |
| 59 | accuracy | Closeness to a true or accepted reference value; distinct from repeatability. | assess measurement accuracy | Accuracy could not be demonstrated simply by obtaining the same wrong value three times. |
| 60 | ion chromatography | An analytical method that separates and measures ions. | ion chromatography results | The report linked the ion chromatography results to particular chemical species rather than to total dust. |
A tight cluster of results is reassuring about precision, not a universal certificate of accuracy. Draw three closely grouped marks away from a target to remember the difference. The drawing is a learning analogy, not an instrument-validation method.
A core becomes a time record through evidence and modelling. Dates do not arrive politely printed on every crystal.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 61 | chronology | An ordered account of when events or layers belong. | establish a chronology | The chronology was explained before the class interpreted a change as a historical trend. |
| 62 | dating | Assigning an age or date using an identified method. | independent dating evidence | The student named the dating method instead of saying that the age was simply known. |
| 63 | annual layer | A layer interpreted as representing one year, supported by suitable evidence. | annual layer counting | Annual layer counting required recognisable seasonal evidence rather than equally spaced pencil marks. |
| 64 | seasonality | A pattern associated with changes through the year. | chemical seasonality | The loss of chemical seasonality made the comparison harder to read as a yearly sequence. |
| 65 | marker horizon | An identifiable layer that can help correlate or date a sequence. | a dated marker horizon | The imagined marker horizon anchored one part of the chronology but did not date every sample automatically. |
| 66 | age model | An explicit relationship used to estimate age through a sequence. | an age model | The age model listed its assumptions so another reader could assess the estimated dates. |
| 67 | depth-age relationship | The relationship between position in a sequence and estimated age. | a nonlinear depth-age relationship | A nonlinear depth-age relationship warned the class against using one fixed number of years per metre. |
| 68 | interpolation | Estimating values between known points; it relies on assumptions about the interval. | linear interpolation | Linear interpolation gave an exercise answer between two dates, not independent evidence for that answer. |
| 69 | temporal resolution | The time interval represented or distinguishable in a record. | fine temporal resolution | The graph’s fine temporal resolution was useful only where dating and preservation supported it. |
| 70 | age uncertainty | The uncertainty attached to an estimated age or date. | report age uncertainty | The caption reported age uncertainty rather than presenting each estimated date as exact. |
Older is comparative; ancient is a broad descriptive adjective. Neither supplies a numerical date. When a task asks how much time separates two samples, you need the chronology, not a more dramatic adjective.
Graphs are compact arguments. Read their labels before enjoying the line.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 71 | profile | A sequence of measurements arranged along depth, distance or another defined dimension. | a chemical profile | The chemical profile plotted concentration against depth and identified the units on both axes. |
| 72 | axis | A reference line on a graph; plural: axes. | label each axis | The learner checked each axis before describing the curve as a change through time. |
| 73 | unit | A defined quantity used to express a measurement. | consistent units | Consistent units made the two concentration tables comparable without a hidden conversion. |
| 74 | peak | A local high point in a measured sequence; not necessarily one event or one source. | a concentration peak | The peak attracted attention, but its historical meaning still needed dating and source evidence. |
| 75 | baseline | A defined comparison level; its choice should be stated. | a local baseline | The student described the peak relative to a local baseline rather than to an unexplained zero. |
| 76 | variability | The extent or pattern of differences among measurements. | seasonal variability | Lower variability could reflect alteration rather than a genuinely quieter past environment. |
| 77 | trend | A broader directional pattern, distinct from an isolated high value. | a long-term trend | One conspicuous peak did not establish a long-term trend across the entire record. |
| 78 | anomaly | A departure from an expected or reference pattern. | investigate an anomaly | The anomaly was flagged for investigation instead of being quietly removed from the table. |
| 79 | outlier | An observation unusually distant from others under a stated comparison. | a possible outlier | The learner asked whether the outlier reflected a real event, an error or a different process. |
| 80 | smoothing | A method of reducing short-scale variation in displayed or analysed data. | apply smoothing | The smoothed curve looked calmer, but smoothing had not repaired damaged evidence. |
A smoother line can be a display choice, an analytical choice or a sign of altered material. Those are different explanations. Name the operation or mechanism rather than treating a pleasing curve as a stronger result.
These words make scientific English appropriately confident. Caution is useful when it names a real limitation, not when it turns every sentence into fog.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 81 | proxy | A measured feature used as indirect evidence for another variable or process. | a climate proxy | The student explained what the proxy represented and why the relationship was plausible. |
| 82 | reconstruction | An evidence-based estimate of past conditions. | a climate reconstruction | The reconstruction combined dated evidence with an explicit account of its limitations. |
| 83 | inference | A conclusion drawn through reasoning from evidence. | a cautious inference | The inference followed the measurements but was not identical to the measurements themselves. |
| 84 | correlation | A statistical association; it does not alone demonstrate causation. | a strong correlation | The discussion separated a correlation between records from a proven physical cause. |
| 85 | causation | A relationship in which one factor produces or contributes to an effect. | evidence of causation | Evidence of causation required more than two curves rising at similar times. |
| 86 | confounder | A factor that can complicate interpretation of an apparent relationship. | a potential confounder | Changing sample resolution was considered a potential confounder in the invented comparison. |
| 87 | replication | Repetition of a study or observation to test whether a finding recurs. | independent replication | Independent replication would strengthen confidence without guaranteeing that every glacier behaved alike. |
| 88 | corroboration | Support from additional evidence or a different line of investigation. | seek corroboration | The class sought corroboration from another record before accepting its broad historical explanation. |
| 89 | uncertainty | A stated lack of exactness or confidence; it can be quantified or described. | quantify uncertainty | The report made uncertainty visible rather than hiding it behind an exact-looking date. |
| 90 | limitation | A boundary on what a method, sample or result can establish. | acknowledge a limitation | The limitation concerned the preserved chemistry, not whether all ice research was useful. |
A precise limitation improves an explanation. “This record cannot resolve that interval reliably” gives a reader a usable boundary; “science is uncertain” gives very little help.
An archive includes its documentation. A beautiful sample with a missing identity can become a very expensive mystery.
| No. | Word or term | Meaning and usage | Natural collocation | Original example |
|---|---|---|---|---|
| 91 | archive | A preserved collection or record available for later study. | a natural climate archive | The class distinguished the natural climate archive from the digital archive holding its measurements. |
| 92 | metadata | Information describing data, including their origin, units and methods. | complete sample metadata | The metadata explained where the numbers came from and what each column represented. |
| 93 | provenance | The documented origin and history of material or information. | sample provenance | Sample provenance connected the laboratory result to a particular core and collection event. |
| 94 | identifier | A unique label used to distinguish an item within a system. | a sample identifier | The same identifier appeared on the sample record and the corresponding measurement row. |
| 95 | inventory | An organised list of holdings or items. | a core inventory | The inventory showed which sections were available without implying they all had identical preservation quality. |
| 96 | repository | A place or system that stores material or data for access and preservation. | a data repository | The repository entry included a method description as well as a downloadable table. |
| 97 | cold chain | A managed sequence of temperature-controlled storage and transport. | maintain the cold chain | The catalogue documented the cold chain rather than assuming that arrival alone proved unchanged condition. |
| 98 | integrity | The condition of being complete or uncompromised; specify physical, chemical or data integrity. | chemical integrity | A physically intact cylinder did not automatically demonstrate chemical integrity throughout its length. |
| 99 | accession | The formal addition of an item to a collection, or its assigned record. | an accession record | The accession record made the new core section traceable within the collection. |
| 100 | reanalysis | A new analysis of existing material or data, potentially using another method. | future reanalysis | Careful documentation preserved the possibility of future reanalysis by researchers asking different questions. |
“Stored” describes a location or action. “Preserved for a specified analysis” is a stronger, testable claim. Good scientific communication keeps the two apart.
Worked example: one metre is not one unit of time
Imagine a deliberately simplified teaching record with dated points at 1 metre = 2010, 2 metres = 2000, and 3 metres = 1999. These invented values are not measurements from Corbassière or any other glacier. From 1 to 2 metres, the assigned dates span ten years. From 2 to 3 metres, they span one year. Equal depth intervals therefore represent unequal time intervals in this model.
Think aloud: “First I read the depth units. Next I read the dates. I subtract dates only within the named interval. I do not assume a fixed rate for the entire core.” The conclusion is modest but important: one year per metre cannot describe both intervals. It does not tell us which physical processes created the pattern. That would require information beyond these three dated points.
Now suppose a learner estimates the date at 1.5 metres as 2005. That follows from linear interpolation between 2010 and 2000. The arithmetic is fine, but the estimate assumes an appropriate relationship within that interval. It is not a newly measured date. A strong explanation names both the operation and the assumption: “Using linear interpolation between these two control points, the estimated date is 2005.”
Change the problem: keep all three dates but add a possible missing layer between 1 and 2 metres. The previous smooth interpolation may no longer be appropriate. This is the diagnostic breakpoint. A learner who remembers only the arithmetic repeats 2005 confidently. A learner who understands the model asks how the hiatus changes the relationship before giving a revised estimate.
Finally consider a flattened chemical profile. A tempting sentence is “There was no pollution during this period.” A better first response is “Could the evidence have been redistributed or lost after deposition?” The Swiss case makes that question real, but it does not supply a universal answer for every core. A missing peak is not automatically a missing historical event.
A miniature reading: the exhibition label that needed one more sentence
The following scene is fictional. At a school display, Sam writes: “This ice contains the weather.” Mina pauses with the marker still uncapped. It is an excellent opening for a conversation and a rather ambitious scientific claim. They replace it with: “This ice may preserve evidence used to investigate past atmospheric conditions.” Then they add what was measured, how it was dated and whether alteration was assessed.
Their final label has four jobs: identify the material; name the measurement; explain the inference; state a limitation. It reads: “This diagram represents an ice-core concentration profile. Each point refers to a labelled depth interval. A chronology is needed before the pattern can be interpreted through time. Meltwater movement can affect some chemical records, so preservation must also be assessed.” No imaginary quotation from a scientist is needed.
A country label is useful, but it is not a method. Switzerland includes different landscapes, linguistic communities and research settings; Alpine glacier evidence is one part of that wider picture. The Switzerland learning guide places glaciers alongside other geographical and cultural questions. Use it to widen the context, not to treat one glacier as a summary of national life.
For a reading task, underline the verbs preserve, measure, estimate and infer. Then ask which verb belongs to which stage. For a writing task, replace a vague “shows” with the most accurate one. “The instrument measures concentration” and “the reconstruction estimates earlier conditions” tell the reader more than two sentences saying that everything shows everything.
For students, parents and teachers: repair the link, then change the task
Students: if you can define ten terms but cannot connect them, practise one chain: deposition → preservation or alteration → measurement → dated interpretation. Explain each arrow in your own words. Stop where you need a prompt. That is your next learning target, not evidence that you must restart all 100 words.
Parents: ask “Which statement is measured, and which is inferred?” rather than testing only spellings. Let the learner answer before offering vocabulary. If the distinction remains unclear, use a familiar analogy: a receipt is evidence of a purchase, not a complete account of why it happened. Return to the ice example afterward so the analogy does not replace the science.
Teachers: assess a changed case. Give one profile plotted by depth and another plotted by estimated age. Ask what extra work made the second possible. The English tuition guide for Switzerland starts with the learner’s actual programme and language task, while Tuition | Zurich distinguishes completing work with help from independent recognition. Those are useful educational distinctions, not claims that eduKate operates a centre in Switzerland.
Practice: read, repair and explain
A. A core remains physically intact, but dissolved ions have moved between layers. Which distinction explains why the archive may still be unsuitable for a particular chemical reconstruction?
B. In the invented chronology, 1 metre is dated 2010, 2 metres 2000, and 3 metres 1999. How many years are represented by each one-metre interval?
C. A sample result is below the detection limit. Rewrite: “The substance definitely was not present.”
D. Three repeated measurements agree closely but differ from a reliable reference value. Which is demonstrated: precision, accuracy, both or neither?
E. A graph has concentration on the horizontal axis and depth on the vertical axis. What additional relationship is needed before you describe the pattern as a dated historical sequence?
F. Write two sentences using proxy, reconstruction and limitation. Make clear which is indirect evidence and which is an interpretation of past conditions.
Answers and explanations
A. Physical integrity is not the same as chemical integrity. Redistribution may compromise the original depth pattern even when the cylinder remains intact. Specify the chemical question rather than declaring every possible analysis impossible.
B. The 1–2 metre interval spans ten years; the 2–3 metre interval spans one year. The depth-age relationship is not described by a single constant rate in this invented record.
C. “The substance was not detected above the stated detection limit under these measurement conditions.” This preserves the method’s boundary without converting nondetection into proof of absolute absence.
D. Precision is demonstrated by the close agreement. Accuracy is not established and the discrepancy suggests a problem requiring investigation. Repetition alone does not remove systematic error.
E. A justified depth-age relationship, including its dating evidence and uncertainty. The depth axis does not turn into a time axis merely because the reader wants to discuss history.
F. One possible response: “The measured feature acts as a proxy for a past environmental variable. The reconstruction uses that relationship, but alteration of the preserved record is an important limitation.” Stronger answers identify the particular feature and variable when those are known.
From retrieval to a clear science explanation
Close the tables and retrieve five pairs: snow/firn, layer/annual layer, concentration/source attribution, precision/accuracy, and archive/reconstruction. For each pair, give one difference and one sentence where confusing them would change the meaning. Check afterward. Retrieving first makes the check informative; looking first can make recognition feel like mastery.
For speaking, explain an imaginary exhibition diagram in 45 seconds to someone who has never seen an ice core. Include one concrete object, one measurement, one inference and one boundary. Repeat with the listener asking, “How do you know the date?” Your answer should change to address the question rather than simply becoming louder.
For writing, produce a 120-word briefing beginning with the research question, not an impressive instrument name. Identify the sample and measurement, explain the dating requirement, and finish with what cannot yet be concluded. The Vocabulary Learning Hub supports this move from recognising words to retrieving and using them. Return to the same task later with a different graph: transfer is the next test.
Frequently asked questions
Are these 100 words unique to Switzerland?
No. Most are international English scientific terms. Switzerland supplies a documented research context, especially the difference between surviving ice and a reliable chemical archive. The list is useful for reading science, discussing evidence and writing careful explanations elsewhere too.
Does a deeper core sample always have an exact older date?
Depth is not an exact calendar. Dating requires evidence and an appropriate model, and disturbed or missing layers can complicate a sequence. A careful reader checks how dates were assigned and what uncertainty accompanies them.
Are ice cores simply thermometers from the past?
No. They can preserve several kinds of evidence, and different measurements address different questions. A proxy relationship requires interpretation. Do not treat an ion concentration, a water-isotope ratio and a trapped-gas measurement as interchangeable readings.
Does the Corbassière finding apply to every Swiss glacier?
The cited 2024 report concerns particular cores and a particular preservation problem at Corbassière. It is a warning about archive vulnerability, not a licence to declare all Alpine or polar records unusable.
Must I learn all the chemical terms before writing?
Start with sample, layer, measurement, chronology, proxy and limitation. Write one accurate explanation, then add chemical specificity when the source supplies it. A shorter correct explanation is more useful than a paragraph of disconnected technical nouns.
Can this guide teach me to collect a core?
No. It teaches vocabulary and reasoning from published material. Glacier work and laboratory analysis require specialist training, appropriate equipment and authorised procedures; the classroom exercises require only reading, drawing and calculation.
Sources and the scope of this guide
Scientific and educational sources checked on 16 October 2026. Definitions, collocations, fictional scenes and exercises are written for this guide. The dated Swiss case is distinguished from general background; historical source pages do not establish current glacier access or programme operations.
Paul Scherrer Institute: Corbassière chemical-archive study, 26 January 2024 — comparison of the 2018 and 2020 cores and the interpretation of melt-related loss of chemical information.
NSIDC: What do ice cores reveal about the past? — general snow, firn, ice-core and palaeoclimate background; polar illustrations are not presented as Swiss observations.
PSI: Multiphase snow chemistry — snow chemistry, interfaces and processes relevant to the movement and preservation of impurities.
PSI: Ice-chemistry research description — the range of analytical evidence, including major ions, water isotopes and black carbon.
NSIDC: Science of glaciers — general glacier processes and the need to distinguish movement, accumulation and loss.
Oxford Learner’s Dictionary: glacier — English headword meaning and geographical usage.
NIST Technical Note 1297: terminology — the distinction between accuracy, precision and specified measurement conditions.
Next route: explain what the archive can still answer
If layers and dates are still tangled, repeat the worked example with new invented dates and explain each assumption aloud. If the calculation is secure but your paragraph overclaims, return to proxy, inference, corroboration and limitation. The repair should match the observed difficulty.
Then choose one published research figure, read its caption and write a question that the figure can answer and a question it cannot answer alone. That is the useful destination of this vocabulary list: not sounding as though you own a laboratory, but helping another person understand what its evidence means.