---
title: Weathering and erosion — how Mova does on the tests · Geography
description: Lesson 52 of the geography course of Mova's primary school: 9 of 11 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Weathering and erosion

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**Tests:** 9 of 11 right · **Exam:** 2 of 4 right · **Kind:** plain · **Understood:** 10 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 52 of the geography course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/geography/52-weathering-and-erosion/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/).

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### Test 1 · right ✓ {#t1}

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my mate says weathering and erosion is the same thing innit

- **1.** No, weathering only means rainy days — no support
- **2.** Yes, they are just two names for one thing, he's spot on — no support
- **3.** No, weathering breaks rock in place, erosion moves the bits away — **← Mova's choice** · **✓ the right answer** · score 12
- **4.** No, erosion happens only in space — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 12, the only option with support. Its support: lesson 52, line 10: «The difference is simple: weathering breaks rock in place, erosion moves the pieces away.», reached through the remembered sentence the question matched. What matched: the same thing acted on «rock» (+5); the same place «place» (+4); the same action «break» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t1/)

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### Test 2 · right ✓ {#t2}

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A milk bottle full of water was left outside in a frosty night and cracked. Which rock process does this copy?

- **1.** Frost weathering, as freezing water expands — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Erosion by wind blasting sand against rock — no support
- **3.** Rain slowly dissolving a block of limestone — no support
- **4.** Deposition at a river mouth — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t2/)

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### Test 3 · right ✓ {#t3}

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An old limestone church statue has a blurred, melted-looking face. What most likely did it?

- **1.** Wind blowing sand at it from a far desert — no support
- **2.** Slightly acidic rain slowly dissolving it — **← Mova's choice** · **✓ the right answer** · score 10
- **3.** A glacier scraping past it — no support
- **4.** Earthquakes shaking it again and again — no support

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**Why:** It took the question to ask what is done. It chose option 2 with score 10, the only option with support. Its support: lesson 46, line 6: «A volcano is an opening in the crust where melted rock, gas and ash escape from inside the Earth.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same action «melt» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t3/)

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### Test 4 · right ✓ {#t4}

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A pavement is pushed up and cracked next to a big old tree. Why?

- **1.** Worms ate the stones — no support
- **2.** The tree's roots grew under and split it — **← Mova's choice** · **✓ the right answer** · score 2
- **3.** Rain made the pavement swell and grow — score 2
- **4.** The pavement melted in the hot summer sun — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 52, line 2: «Leave a full glass bottle of water in the freezer and it can crack, because water grows by about 9% when it freezes. The same thing happens in the cracks of ro…», reached through the cause of the sentence the question matched. What matched: the same action «grow» (+4). Against it: a different doer (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t4/)

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### Test 5 · right ✓ {#t5}

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A muddy river reaches a calm lake and the water clears. What happened to the mud?

- **1.** The mud floated up into the clouds as steam — no support
- **2.** The mud dissolved into nothing — no support
- **3.** The mud turned into fish food at once and was all eaten up — no support
- **4.** The water slowed and dropped it, which is deposition — **← Mova's choice** · **✓ the right answer** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 52, line 13: «When water or wind slows down, it drops what it carries, a process called deposition.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «water» (+3); the same action «slow down» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t5/)

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### Test 6 · right ✓ {#t6}

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What would happen if Earth had no rain, rivers or ice at all?

- **1.** Erosion would be far slower, as running water is its strongest agent — **← Mova's choice** · **✓ the right answer** · score 4
- **2.** Rocks would grow back together — score 2
- **3.** Mountains would wear down much faster, with nothing to protect them — no support
- **4.** Deserts would turn into forests — no support

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**Why:** It took the question to ask what happens next. It chose option 1 with score 4, against 2 for the next best. Its support: lesson 52, line 11: «Running water is the most powerful agent of erosion on Earth.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «powerful agent» (+2); the same circumstance (+2); the same light verb (be, have, do, get, go) (+1). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t6/)

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### Test 7 · wrong ✗ {#t7}

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Grandad: "bloody farm next door ripped out all the trees, now the field washes into the road every storm." Why?

- **1.** Soil grows faster without trees — **← Mova's choice** · no support
- **2.** Without trees, soil erodes many times faster — **✓ the right answer** · no support
- **3.** Roads attract soil like a magnet — no support
- **4.** Trees cause storms, so removing them is bad — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t7/)

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### Test 8 · right ✓ {#t8}

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A game says mountains last for ever and never change. What is true?

- **1.** Mountains melt a little every summer and refreeze in winter — no support
- **2.** Mountains are slowly worn down over millions of years — **← Mova's choice** · **✓ the right answer** · score 4
- **3.** Mountains only change in earthquakes — score 3
- **4.** Mountains are built new every year — score 3

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 4, against 3 for the next best. Its support: lesson 52, line 14: «Even great mountains are slowly worn down, and old mountains like those of Scotland were once as high as the Alps.», reached through the option's own match among the sentences about the question's things. What matched: the same action «wear down» (+2); the same thing acted on «great mountains» (+1); the same property (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t8/)

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### Test 9 · right ✓ {#t9}

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Strange mushroom-shaped rocks stand in a sandy desert. What most likely shaped them?

- **1.** Tree roots growing all round them — no support
- **2.** Wind blasting sand against them — **← Mova's choice** · **✓ the right answer** · score 13
- **3.** Frost in a hot, steamy rainforest — no support
- **4.** Ocean waves that once crashed there — no support

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**Why:** It took the question to ask what it is done to. It chose option 2 with score 13, the only option with support. Its support: lesson 52, line 12: «In deserts wind blasts sand against rocks and carves strange shapes.», reached through the remembered sentence the question matched. What matched: the same circumstance (+4); it fills the role the question asks for (+4); the same action «blast» (+3); the same thing acted on «sand» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t9/)

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### Test 10 · wrong ✗ {#t10}

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Lily: "the rock got broken by frost and then the stream took the bits — that's all weathering." What should she change?

- **1.** The frost part is erosion too — no support
- **2.** Neither part is weathering nor erosion — no support
- **3.** Streams only drop rocks, never carry them — **← Mova's choice** · score 6
- **4.** The stream taking the bits is erosion — **✓ the right answer** · score 4

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**Why:** It took the question to ask what it is done to. It chose option 3 with score 6, against 4 for the next best. Its support: lesson 52, line 1: «Rocks look as if they last for ever, but they are slowly being broken and carried away. Breaking rock where it stands is called weathering; carrying the bits a…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «rock» (+3). Against it: a different action (counts against) (-1). The right option, 4, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t10/)

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### Test 11 · right ✓ {#t11}

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Why are Scotland's mountains so much lower than the Alps today?

- **1.** They are sinking into the sea — no support
- **2.** People cut their tops off for building stone — no support
- **3.** They were never more than small hills — no support
- **4.** They are very old and have been worn down — **← Mova's choice** · **✓ the right answer** · score 3

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 3, the only option with support. Its support: lesson 52, line 14: «Even great mountains are slowly worn down, and old mountains like those of Scotland were once as high as the Alps.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «old mountains» (+2); the same property (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the principal distinction between weathering and erosion.

- **1.** Weathering is caused by animals, whereas erosion is caused by volcanoes — no support
- **2.** Weathering creates rock, whereas erosion destroys it — **← Mova's choice** · score 5
- **3.** Weathering occurs solely in winter, whereas erosion occurs in summer — no support
- **4.** Weathering disintegrates rock in situ, whereas erosion removes the fragments — **✓ the right answer** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 52, line 5: «Weathering is the breaking down of rock where it is, by weather, chemicals and living things.», reached through the remembered sentence the question matched. What matched: the same thing acted on «rock» (+5). The right option, 4, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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Ascertain the agent of erosion acknowledged to be the most powerful upon the Earth.

- **1.** Running water — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Glacial ice in deserts — no support
- **3.** Burrowing animals — no support
- **4.** Wind in arid regions — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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Select the response that is consistent with the established facts concerning deposition.

- **1.** Deposition denotes the dissolution of limestone — **← Mova's choice** · no support
- **2.** Deposition denotes the freezing of water in rock fissures — no support
- **3.** Material is deposited when the transporting water or wind loses speed — **✓ the right answer** · no support
- **4.** Material is deposited when the water accelerates — no support

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**Why:** Nothing it remembers matched the question, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Which of the following statements most accurately characterises the consequence of deforestation upon soil?

- **1.** Erosion of soil may proceed many times more rapidly than at natural rates — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Soil is thereby rendered immune to erosion — no support
- **3.** Soil formation is thereby accelerated beyond all natural rates observed — no support
- **4.** No consequence whatsoever is observed — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/52-weathering-and-erosion/e4/)

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- ← previous: [51. Gemstones and precious metals](https://md.mova.elamur.ai/free/en/school-run/geography/51-gemstones-and-precious-metals/)
- next →: [53. Rivers shaping the land](https://md.mova.elamur.ai/free/en/school-run/geography/53-rivers-shaping-the-land/)
- ↑ back to [Geography](https://md.mova.elamur.ai/free/en/school-run/geography/)