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Top 100 Mercury Mining Heritage Vocabulary Words | Slovenia

Three learners review open books together at a classroom table, with stacks of textbooks, stationery and a whiteboard in the bright room.

A mine is never just a hole in the ground. Someone had to move material, keep water under control, maintain machinery, record work and live with the consequences. This guide teaches 100 useful English vocabulary words for understanding mercury mining heritage through Idrija in Slovenia, connecting geology and engineering with workers, environmental questions and museum interpretation.

Idrija makes the vocabulary unusually tangible. Its heritage forms part of UNESCO’s Heritage of Mercury, Almadén and Idrija, shared with Spain and inscribed in 2012. The preserved story extends from underground workings to water systems, processing equipment and the town. English learners can follow a material through a system while asking whose work and experience the records preserve.

Start with an official museum or heritage account, choose one ten-word group, and explain one connection before moving on. “Top 100” is a curated learning selection, not a measured word-frequency ranking. These are mainly English geological, industrial and historical terms, with two labelled Slovenian names. The fictional calculations use paper records only; this article supplies no instructions for extracting, heating or handling mercury-bearing material.

Begin with three distinctions that a shiny specimen can hide

Ask the learner to explain the difference between mercury and cinnabar. Mercury names an element; cinnabar is a mercury sulphide mineral. If those ideas are insecure, return to a simple word-and-picture comparison of element, compound, mineral and rock before introducing a processing diagram. A remembered red colour is not a chemical definition, and the amount of ore is not automatically the amount of metal it contains.

Next ask whether a horizontal passage and a vertical shaft are the same thing. Then ask whether a museum’s preservation of a machine endorses every historical use of that machine. These questions locate three different gaps: material meaning, spatial meaning and historical judgement. Teach the specific relationship that is missing. An accurate short explanation is a better starting point than a long paragraph built around a misunderstood noun.

Contents: ten groups of ten words

Words 1–50

1–10: Geology and the material itself

11–20: Reading an underground drawing

21–30: Moving material and managing water

31–40: Reading a processing account

41–50: Quantities that need their units

Words 51–100

51–60: People and working lives

61–70: Environmental consequences and continued care

71–80: A town becomes industrial heritage

81–90: Reading records and museum labels

91–100: Writing an industrial explanation

Worked example · Learning method · Practice · Questions · Sources

WORD GROUP 1 OF 10

1–10. Geology and the material itself

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The Slovenian Museum of Natural History distinguishes native mercury from mercury combined with sulphur in cinnabar. Use that distinction to organise the first group.

No.Word or termMeaning and usageNatural collocationOriginal example
1mercuryThe chemical element Hg, a metal liquid at ordinary room temperature.elemental mercuryThe display distinguishes elemental mercury from a mercury-bearing mineral.
2quicksilverA traditional English name for mercury, common in older accounts.historic quicksilver tradeThe text explains the historic quicksilver trade using the modern element name.
3cinnabarA mercury sulphide mineral, an important mercury ore.cinnabar specimenThe catalogue identifies the red cinnabar specimen by its mineral name.
4elementA substance whose atoms have the same proton number.chemical elementMercury is a chemical element, not a mixture of metals.
5compoundA substance formed from chemically combined elements in fixed relationships.chemical compoundThe lesson distinguishes a chemical compound from a loose mixture.
6mineralA naturally occurring substance characterised by composition and structure.mineral specimenThe museum record names the mineral specimen.
7oreNatural material from which a useful substance can be economically extracted in a stated context.mercury oreThe historical account follows mercury ore from the mine.
8depositA natural accumulation of geological material.ore depositThe map identifies the area of the ore deposit.
9nativeOccurring in an uncombined elemental state in mineralogical usage.native mercuryThe source distinguishes native mercury from cinnabar.
10host rockThe rock containing a mineral deposit or feature.surrounding host rockThe diagram separates the ore-bearing feature from surrounding host rock.
Geology and the material itself

A mineral specimen, a geological deposit and an economically worked ore are different scales of description. Keep the relevant scale in the sentence.

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WORD GROUP 2 OF 10

11–20. Reading an underground drawing

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These terms help interpret public plans and historical descriptions. They are not directions for entering a mine or assessing an underground space.

No.Word or termMeaning and usageNatural collocationOriginal example
11aditA horizontal or near-horizontal passage leading into a mine from the surface.mine aditThe sketch shows a mine adit entering the hillside.
12shaftA vertical or inclined excavation providing access between mine levels.vertical shaftA vertical shaft connects the levels on the drawing.
13levelA mine working or group of passages at a particular depth.underground levelThe historical plan labels each underground level separately.
14galleryAn underground passage or working; usage depends on context.mine galleryThe model shows a mine gallery extending away from the shaft.
15workingAn excavated part of a mine, often used in the plural.old workingsThe map distinguishes old workings from the visitor display.
16veinA mineral-filled fracture or zone within rock.mineral veinThe simplified drawing highlights a mineral vein.
17faultA fracture or zone along which rock has moved.geological faultThe geological fault belongs to the rock history, not the machine layout.
18stratumA layer of rock or sediment; plural strata.rock stratumThe drawing follows one rock stratum beneath the slope.
19sectionA view showing an imagined cut through a structure or ground.geological sectionA geological section reveals relationships hidden on a surface map.
20gradientThe change in height over a horizontal distance.passage gradientThe passage gradient is marked on the fictional plan.
Reading an underground drawing

Draw an imaginary hillside with a horizontal adit and a vertical shaft. Ask a partner to explain which route reaches which point without changing the labels.

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WORD GROUP 3 OF 10

21–30. Moving material and managing water

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A mine depends on connected equipment and flows. Transporting ore and removing water are different jobs even when their infrastructure sits close together.

No.Word or termMeaning and usageNatural collocationOriginal example
21hoistA device that raises or lowers a load.mine hoistThe mine hoist has a different role from the drainage pump.
22winchA device using a drum and cable to pull or lift.cable winchThe exhibit identifies a cable winch in the transport system.
23cablewayA transport system using suspended cables.ore cablewayThe documented ore cableway linked stages of the industrial system.
24conveyorA device moving material along a set path.conveyor beltThe conveyor belt carried material towards another processing stage.
25wagonA wheeled vehicle for carrying goods or materials.ore wagonAn ore wagon appears in the historical photograph.
26pumpA device moving liquid or gas through a system.drainage pumpThe drainage pump’s task is to move water.
27drainageThe movement or removal of excess water.mine drainageMine drainage is a continuing management question in the account.
28waterwheelA wheel driven by moving water.wooden waterwheelThe heritage source describes a wooden waterwheel.
29kamštSlovenian, Latin script: the mine water-pumping device named in Idrija’s heritage account.preserved kamštThe preserved kamšt connects water power with mine drainage.
30klavžeSlovenian, Latin script: water barriers used historically to release water for floating timber.historic klavžeThe source explains how historic klavže supported timber transport.
Moving material and managing water

Follow one arrow at a time: what moves, from where, towards what destination, powered by what? The same questions help with many industrial-history texts.

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WORD GROUP 4 OF 10

31–40. Reading a processing account

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The vocabulary below explains historical industrial descriptions at a conceptual level. A named machine and a complete operating procedure are very different kinds of information.

No.Word or termMeaning and usageNatural collocationOriginal example
31crushingBreaking material into smaller pieces through mechanical force.ore crushingThe museum account identifies ore crushing as one process stage.
32sortingSeparating material into groups by specified characteristics.ore sortingOre sorting appears separately from extraction in the display.
33sievingSeparating particles using a mesh or perforated surface.mechanical sievingThe process diagram labels mechanical sieving.
34furnaceAn enclosed structure or device for high-temperature industrial heating.rotary furnaceThe documented rotary furnace belongs to the processing plant.
35smeltingThermal extraction of metal from ore in industrial usage.historic smeltingThe exhibition explains historic smelting without inviting imitation.
36retortA vessel used for heating material and directing resulting vapour or gas.historic retortThe museum account describes a historic retort as part of changing technology.
37vapourA substance in gaseous form that can otherwise be liquid or solid.mercury vapourThe historical description distinguishes mercury vapour from liquid metal.
38condensationA change from gas or vapour into liquid.vapour condensationThe diagram represents vapour condensation conceptually.
39flueA passage carrying gases from a furnace or similar installation.furnace flueThe old plan labels the furnace flue.
40residueMaterial remaining after a process.processing residueThe record distinguishes processing residue from recovered output.
Reading a processing account

A photograph of a furnace cannot establish its temperature, output, emissions or operating date. Use the accompanying documentation for those claims.

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WORD GROUP 5 OF 10

41–50. Quantities that need their units

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Ore mass, contained metal and recovered output should be recorded separately. A larger load can contain more metal overall while having a lower concentration.

No.Word or termMeaning and usageNatural collocationOriginal example
41massThe amount of matter in an object or material, expressed in units such as kilograms.ore massThe fictional ledger records ore mass separately from contained metal.
42gradeThe concentration of a valuable constituent in ore.ore gradeA larger load can have a lower ore grade.
43concentrationThe amount of a constituent relative to a stated total.metal concentrationMetal concentration needs a clear basis and unit.
44assayAn analysis determining the amount of a constituent.assay resultAn assay result should be tied to the sampled material.
45sampleA portion selected to represent or investigate material.representative sampleA representative sample is a goal requiring an appropriate method.
46throughputThe amount processed within a stated time.hourly throughputHourly throughput describes a rate rather than a total stock.
47outputThe product or amount produced by a process.recorded outputRecorded output is not identical to metal initially contained in ore.
48recoveryThe proportion of a target constituent obtained from a process feed.metal recoveryMetal recovery requires both feed and recovered amounts.
49capacityThe maximum or rated amount a system can handle under specified conditions.rated capacityRated capacity is different from the output of one historical shift.
50balanceAn accounting relationship between inputs, outputs and changes.material balanceA material balance needs every relevant stream to be considered.
Quantities that need their units

Read every number with its noun and unit. The worked example later changes one quantity to show why a familiar calculation still needs fresh interpretation.

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WORD GROUP 6 OF 10

51–60. People and working lives

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Technical history includes labour, expertise and domestic life. A machine’s elegant design does not tell the whole story of the work around it.

No.Word or termMeaning and usageNatural collocationOriginal example
51minerA person working in mineral extraction.mine workerThe record identifies the miner’s role rather than only naming the machine.
52shiftA scheduled period of work.working shiftThe fictional ledger covers one working shift.
53foremanA person supervising a group of workers; historical job title.shift foremanThe historical account identifies the shift foreman.
54craftspersonA person skilled in making or maintaining things.skilled craftspersonA skilled craftsperson maintained the mechanism in the fictional account.
55maintenanceWork intended to keep equipment or structures in suitable condition.machine maintenanceMachine maintenance requires knowledge as well as tools.
56expertiseSpecialised knowledge developed through study or experience.technical expertiseThe oral history records technical expertise absent from the diagram.
57wagePayment for labour, often linked to time or work performed.wage recordA wage record answers a different question from an equipment inventory.
58householdPeople sharing a home or domestic arrangements.mining householdThe exhibition connects a mining household with the wider town.
59testimonyAn account given by a person concerning experience or knowledge.worker testimonyWorker testimony should be attributed to its speaker and context.
60labourWork, or the people performing it; labor in American English.industrial labourThe chapter includes industrial labour alongside machinery.
People and working lives

Preserve attribution in a historical account. A manager’s report and a worker’s testimony can answer different questions and may emphasise different experiences.

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WORD GROUP 7 OF 10

61–70. Environmental consequences and continued care

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These words help read monitoring and management discussions. They do not supply a site-specific exposure assessment or a remediation prescription.

No.Word or termMeaning and usageNatural collocationOriginal example
61emissionA release of a substance into the environment.industrial emissionAn industrial emission claim needs a source and a stated period.
62contaminationThe presence of an unwanted or harmful substance in a material or environment.soil contaminationA single photograph cannot establish the extent of soil contamination.
63exposureContact with a substance or condition; route and amount matter.occupational exposureThe historical account discusses occupational exposure without estimating an individual’s dose.
64hazardA potential source of harm.recognised hazardThe label explains why a recognised hazard belongs in the history.
65riskThe possibility of harm in stated circumstances.site-specific riskSite-specific risk cannot be inferred from a glossary entry.
66monitoringRepeated observation or measurement to track conditions.environmental monitoringEnvironmental monitoring needs identified locations and dates.
67remediationAction intended to address contamination or environmental damage.remediation programmeA remediation programme requires evidence of its actual scope.
68sedimentParticles carried or deposited by water or other processes.river sedimentThe supplied research summary specifies where river sediment was sampled.
69catchmentAn area draining towards a particular watercourse or outlet.river catchmentThe river catchment extends beyond the museum building.
70legacyA continuing consequence or inheritance from the past.industrial legacyAn industrial legacy can include both knowledge and unresolved consequences.
Environmental consequences and continued care

A monitoring result has a place, date, method and purpose. One number without those connections cannot establish the condition of an entire landscape.

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WORD GROUP 8 OF 10

71–80. A town becomes industrial heritage

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Heritage interpretation can connect machinery, buildings, landscapes and records. Its job includes explaining significance and consequences, not only admiring scale.

No.Word or termMeaning and usageNatural collocationOriginal example
71heritageValued inherited resources and relationships from the past.industrial heritageIndustrial heritage includes records, places and working knowledge.
72infrastructureThe connected facilities supporting an activity.mining infrastructureMining infrastructure includes more than underground passages.
73adaptive reuseGiving an existing building or structure a new use.heritage adaptive reuseThe project describes heritage adaptive reuse for education.
74restorationWork intended to recover a known earlier state or legibility.machinery restorationMachinery restoration should be distinguished from original manufacture.
75preservationKeeping something from loss or deterioration.record preservationRecord preservation allows later researchers to revisit the evidence.
76interpretationThe explanation of evidence and significance to an audience.museum interpretationMuseum interpretation can connect technology with lived experience.
77landscapeAn area understood through its physical and human relationships.industrial landscapeThe industrial landscape includes water channels and the town.
78inscriptionFormal inclusion on a recognised list in this context.World Heritage inscriptionThe 2012 World Heritage inscription concerns the shared property.
79serial propertyA heritage property consisting of separate component parts.shared serial propertyThe shared serial property links Idrija and Almadén.
80significanceThe importance or meaning of something within a context.historical significanceHistorical significance requires explanation beyond the object’s size.
A town becomes industrial heritage

The UNESCO property is shared with Almadén in Spain. Shared recognition does not make the two places identical or their histories interchangeable.

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WORD GROUP 9 OF 10

81–90. Reading records and museum labels

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A production date, an installation date and a restoration date can all belong to the same machine. Ask which event each date names.

No.Word or termMeaning and usageNatural collocationOriginal example
81archiveAn organised body or repository of preserved records.industrial archiveThe industrial archive contains plans and written accounts.
82inventoryAn organised list of items or features.machinery inventoryThe machinery inventory identifies the equipment being discussed.
83ledgerA structured book or record of transactions or quantities.production ledgerThe fictional production ledger supplies masses with units.
84captionA short explanation accompanying an image or object.museum captionA museum caption should name what its date refers to.
85provenanceThe documented origin and history of a source or object.document provenanceDocument provenance helps assess the copied plan.
86chronologyThe sequence of events in time.machine chronologyThe machine chronology separates manufacture, installation and restoration.
87attributionThe assignment of authorship or responsibility.source attributionSource attribution preserves the distinction between a witness and an editor.
88corroborationIndependent support for an account or claim.documentary corroborationDocumentary corroboration may strengthen a remembered date.
89replicaA made copy of an object, identified as such.display replicaA display replica should not be labelled as the original machine.
90scale modelA representation made at a specified ratio to the original.museum scale modelThe museum scale model makes the transport route easier to see.
Reading records and museum labels

A label can be concise while remaining precise. The most useful sentence often contains a clear relationship rather than the largest possible number of facts.

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WORD GROUP 10 OF 10

91–100. Writing an industrial explanation

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These words help explain a sequence, a comparison or an uncertainty. They support an account that another reader can check.

No.Word or termMeaning and usageNatural collocationOriginal example
91extractRemove or obtain a substance from material; also a selected passage of text.historical extractionThe paragraph describes historical extraction at a broad conceptual level.
92transportMove people or material from one place to another.transport oreThe display explains how systems were used to transport ore.
93convertChange from one form, state or unit to another.convert the unitsWe convert the units before comparing the two ledger entries.
94compareExamine similarities and differences.compare ore gradesThe exercise asks us to compare ore grades using the same basis.
95distinguishRecognise or explain a difference.distinguish stock from flowA careful account can distinguish stock from flow.
96quantifyExpress an amount or relationship numerically.quantify an outputThe ledger alone may not quantify an output if only feed is recorded.
97inferReach a conclusion from evidence and reasoning.infer a rateWithout a time interval, we cannot infer an hourly rate from a total mass.
98qualifyLimit a statement to make it more accurate.qualify a claimThe writer can qualify a claim by stating the period and location.
99contextualisePlace information within relevant circumstances.contextualise a machineA worker’s account can help contextualise a machine.
100evaluateJudge against stated criteria using relevant evidence.evaluate a proposalTo evaluate a proposal, first explain the criterion being used.
Writing an industrial explanation

Use one technical term, explain it in ordinary language and connect it to a documented feature. Then see whether a partner can retell the relationship accurately.

Contents · Previous group · Worked example

A larger load with a lower grade

Read this fictional paper ledger. It is not a production record from Idrija and involves no physical material. Entry A describes 1,000 kg of ore containing an assumed 2 kg of mercury. Entry B describes 2,000 kg of ore containing an assumed 3 kg of mercury. The question is which entry has more contained metal and which has the higher metal concentration by mass.

For total contained metal, B is larger: 3 kg exceeds 2 kg. For concentration, divide contained metal mass by ore mass on the same basis. A gives 2 ÷ 1,000 = 0.002, or 0.2%. B gives 3 ÷ 2,000 = 0.0015, or 0.15%. A therefore has the higher assumed grade, while B has the larger assumed contained-metal total. Both statements can be true.

A learner may write “B is richer because three is bigger than two.” Ask them to replace richer with a precise noun phrase. More contained metal? Higher concentration? Greater recovered output? Once the question is named, the calculation becomes easier to choose. The word grade is useful because it prevents a total amount from quietly replacing a proportion.

Change the condition: A still has 1,000 kg of ore, but now contains an assumed 1 kg of mercury. Its concentration becomes 0.1%. B remains at 0.15%, so B now has both the larger contained-metal total and the higher assumed grade. Recalculate rather than repeating the earlier conclusion. The structure of the problem is familiar; one changed input reverses part of the answer.

What about recovery? Neither original entry tells us how much metal was actually obtained. Contained metal is an amount in the feed; recovered output requires a further record. Similarly, neither entry states the processing duration, so neither establishes throughput. A complete noun and its unit protect the reader from an attractive but unsupported industrial claim.

Use this original dialogue. Learner: “B produced three kilograms.” Partner: “The ledger says contained, not produced.” Learner: “So I should write that B contained more metal.” Partner: “And what would you need to discuss production?” Learner: “A separate output record.” If the learner understands the arithmetic but not that correction, return to the meaning of the quantity before adding harder numbers.

The waterwheel, the town and the people around the machine

UNESCO’s shared property record links Idrija and Almadén through the history of mercury extraction and exchange. It also recognises the wider technical and social system. A useful learner’s question is “What else had to work for this machine to work?” That question opens a route from an isolated exhibit to infrastructure, labour and landscape without assuming the same arrangement existed in every period.

The Idrija Geopark mining heritage account describes the kamšt water-pumping installation and the klavže barriers associated with floating timber. These are different water-related jobs. It also identifies transport and processing facilities. Follow the documented connections rather than treating every wheel, channel and dam as part of one identical mechanism.

The heritage management centre’s smelting-plant project account dates the restored plant’s opening to 1 February 2017 and describes educational interpretation of technology and its effects. That is a dated project milestone, not a guarantee of current visitor hours. The preserved installation can help explain achievements and consequences together.

eduKateSG’s Slovenia cultural learning guide places Idrija alongside very different subjects, including landscape and urban design. Within the mine story itself, worker testimony, household history and equipment records offer different views. A heritage account can acknowledge ingenuity while asking who supplied the labour, who made decisions and what responsibilities continued after production.

Make the explanation move through the system

For a student, draw four boxes on paper: material, movement, processing and records. Choose a public diagram or museum account and attach one sourced statement to each relevant box. Leave a box empty if the source does not supply the information. A visible gap is more useful than a confident invented connection. Then explain the route aloud using only six selected vocabulary terms.

For a parent, ask “Which quantity does that number describe?” If the learner says two thousand kilograms, ask two thousand kilograms of what. This gentle follow-up often reveals whether the difficulty lies in vocabulary, reading the table or selecting a calculation. Return to the first unstable connection and let the learner attempt a fresh example without the earlier prompt.

For a teacher, begin with the fictional ledger and change one input. Later change the format: replace the table with a short paragraph, or ask the learner to write a caption for a model. The underlying distinction between total and concentration should survive. eduKateSG’s English Tuition | Slovenia guide similarly uses changed conditions to inspect reading and explanation, while keeping actual education routes distinct.

For writing, produce a ninety-word museum label with a named object, a documented function, one relationship to another part of the system and one source boundary. Avoid “the biggest,” “the first” or exact output claims unless the supporting source establishes their scope. For speaking, answer an unexpected follow-up: “Does a restored machine prove it is currently operating?” The eduKateSingapore vocabulary learning route offers a wider method for practising accurate use before testing transfer on a fresh task.

A repair route might focus on ore versus metal. A stabilisation route compares two new records with correct units. An extension route asks how technical evidence and worker testimony complement each other. Singapore learners can read eduKateSG’s Secondary English teaching guide for the wider diagnostic approach. This country article establishes no eduKate teaching centre or programme in Slovenia.

Practice: retrieve, explain and revise

1. Distinguish mercury from cinnabar in one sentence.

2. Which has the higher assumed grade: 2 kg in 1,000 kg, or 3 kg in 2,000 kg?

3. If the first entry changes to 1 kg in 1,000 kg, what changes?

4. Can the ledger establish recovery or hourly throughput?

5. How does an adit differ from a shaft?

6. Why is an opening date for a restored museum plant not its production date?

Answers and explanations

1. Mercury is the chemical element Hg; cinnabar is a mercury sulphide mineral. They are not interchangeable names for the same material form.

2. The first: 0.2% compared with 0.15%, using contained-metal mass divided by ore mass.

3. Its grade becomes 0.1%, so the second entry’s 0.15% is now higher. The second also retains the greater total contained metal.

4. No. Recovery needs a recovered-output amount in relation to the relevant feed, and hourly throughput needs a time interval.

5. An adit leads horizontally or nearly horizontally from the surface into a mine; a shaft is vertical or inclined between levels. Use the site’s documented terminology for named features.

6. The dates name different events. Manufacture, operation, closure, restoration and public opening require their own chronology.

Frequently asked questions

Are all these words unique to Slovenia?

No. Most are English terms used across geology, engineering, industrial history and source reading. Idrija provides a specific setting, and the Slovenian names are labelled.

Does World Heritage recognition mean every historical practice was beneficial?

No. Heritage interpretation can examine technical achievement, labour and consequences together. Recognition does not erase difficult parts of a history.

Is this an extraction or handling guide?

No. The terms support reading and explanation. The calculations are fictional paper exercises, and actual materials or sites require their responsible specialist procedures.

Why include households and testimony in an industrial vocabulary list?

Because equipment depended on people and affected their lives. Those words help keep a technical account connected to its social history.

How can I tell whether I have learned the list?

Explain a new diagram, choose the correct quantity in a fresh record and answer a follow-up without copying definitions. Then revise a sentence that overstates the source.

Sources and scope

Sources checked on 18 October 2026. Institutional and practitioner sources establish the cultural context and selected specialist distinctions. The learning sequence, fictional records, example sentences and exercises are original educational material. This guide teaches vocabulary and careful explanation; practical work requires appropriate instruction and information specific to the person, object or site.

UNESCO: Heritage of Mercury, Almadén and Idrija — Shared property, 2012 inscription and technical, territorial and social heritage context.

Slovenian Museum of Natural History: Mercury — Native mercury and cinnabar distinction, with historical technological context.

Idrija Geopark: Mining heritage — Documented machinery, water-related installations and transport relationships.

CUDHg Idrija: Smelting plant project — The dated restoration project and educational interpretation.

Collins Dictionary: adit — English mining sense for a horizontal or near-horizontal mine entrance passage.

Cambridge Dictionary: cinnabar — English mineral-name sense; this guide’s examples and numbers are original.

Your next route: one machine, four connected questions

Choose a documented machine and answer four questions: what did it do, what did it depend on, who worked around it and which record supports your explanation? If a question remains unanswered, keep it visible. The point is to build a clearer account, not to make a short label pretend it contains the whole industrial past.

Continue through the eduKateSG vocabulary hub for meanings, collocations, retrieval and wider thematic lists. Your next independent task is an unfamiliar source and an explanation that keeps the material, quantities and people connected.