---
title: Coasts and caves — how Mova does on the tests · Geography
description: Lesson 55 of the geography course of Mova's primary school: 4 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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[home](https://md.mova.elamur.ai/free/en/) / [at school](https://md.mova.elamur.ai/free/en/school-run/) / [Geography](https://md.mova.elamur.ai/free/en/school-run/geography/) / 55

# Coasts and caves

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**Tests:** 4 of 11 right · **Exam:** 2 of 4 right · **Kind:** plain · **Understood:** 8 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 55 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/55-coasts-and-caves/).

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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/55-coasts-and-caves/).

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### Test 1 · right ✓ {#t1}

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little sis: "stalagMITES go up, stalacTITES come down — how do i remember?" which is right?

- **1.** Both hang from the roof — score 6
- **2.** Stalactites hang down from the roof, stalagmites grow up — **← Mova's choice** · **✓ the right answer** · score 8
- **3.** Both grow from the floor — no support
- **4.** Stalactites grow up, stalagmites hang down — no support

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**Why:** It took the question to ask what something is like. It chose option 2 with score 8, against 6 for the next best. Its support: lesson 55, line 4: «Inland, caves are made in a different way: slightly acidic rain dissolves limestone. Drip by drip the water leaves stone behind, growing stalactites that hang…», reached through the remembered sentence the question matched. What matched: the same place «roof» (+4); the same doer «stalactites» (+3); the same action «hang down» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t1/)

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### Test 2 · wrong ✗ {#t2}

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A seaside arch has a crack across its top after a winter of storms. What will it probably become one day?

- **1.** A bay, once it grows taller — no support
- **2.** A cave, once it fills with sand — **← Mova's choice** · score 0
- **3.** A stack, once the top falls in — **✓ the right answer** · no support
- **4.** A spit, once it floats away — no support

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**Why:** It took the question to ask who or what does it. It chose option 2 with score 0, the only option with support. Its support: lesson 55, line 7: «Waves cut caves into headlands, the caves join into arches, and when arches fall, stacks are left.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+2). Against it: a different action (counts against) (-2). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t2/)

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### Test 3 · wrong ✗ {#t3}

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A family's house on the Yorkshire coast is 20 metres from the cliff edge. Roughly when could the cliff reach it?

- **1.** In about 1,000 years or so — **← Mova's choice** · no support
- **2.** Never, cliffs do not move — no support
- **3.** Next week, without fail — no support
- **4.** In about 10-20 years — **✓ the right answer** · 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/55-coasts-and-caves/t3/)

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### Test 4 · right ✓ {#t4}

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A groyne, a low wooden wall across a beach, traps sand on one side only. Why?

- **1.** Longshore drift moves sand along the beach and the wall stops it — **← Mova's choice** · **✓ the right answer** · score 6
- **2.** The tide pushes sand inland only — no support
- **3.** The wall attracts sand like a magnet, but only on the side facing the sea — no support
- **4.** Sand only lands on the sunny side — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 6, the only option with support. Its support: lesson 55, line 3: «Watch the sand on a beach where waves come in at a slant: it is moved along the shore, step by step, by longshore drift, and can build a long finger of sand ca…», reached through a sentence linked to the one the question matched. What matched: the same action «move» (+3); the same doer «longshore drift» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t4/)

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### Test 5 · wrong ✗ {#t5}

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"son doong's just a big hole in the ground, nothing special" — what's special about it?

- **1.** It is the deepest hole ever dug by people, deeper than any mine on Earth — **← Mova's choice** · no support
- **2.** It is a volcano crater full of sea water — no support
- **3.** It is a cave made of ice — no support
- **4.** It holds the largest known cave passage, big enough for skyscrapers — **✓ the right answer** · 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/55-coasts-and-caves/t5/)

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### Test 6 · right ✓ {#t6}

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A video game cave has stalactites made in one night by a dragon's breath. What is the real story?

- **1.** They grow slowly from dripping water leaving stone — **← Mova's choice** · **✓ the right answer** · score 7
- **2.** They are carved by miners — score 3
- **3.** They form from frozen bat breath — no support
- **4.** They are made by lava cooling quickly as it drips from the roof — score 3

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**Why:** It took the question to ask what it is done to. It chose option 1 with score 7, against 3 for the next best. Its support: lesson 55, line 4: «Inland, caves are made in a different way: slightly acidic rain dissolves limestone. Drip by drip the water leaves stone behind, growing stalactites that hang…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «water» (+5); the same action «leave» (+3). Against it: a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t6/)

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### Test 7 · wrong ✗ {#t7}

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What would happen if a coast were made only of hard rock of one kind?

- **1.** It would wear back evenly, with fewer headlands and bays — **✓ the right answer** · score 3
- **2.** It would turn into limestone — no support
- **3.** It would form many deep bays, one after another along the shore — **← Mova's choice** · score 6
- **4.** It would never be touched by waves — no support

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**Why:** It took the question to ask what happens next. It chose option 3 with score 6, against 3 for the next best. Its support: lesson 55, line 6: «Coasts with hard and soft rock form headlands and bays, since soft rock wears back faster.», reached through the option's own match among the sentences about the question's things. What matched: the same action «form» (+2); the same doer «coasts» (+2); the same thing acted on «headlands» (+2). The right option, 1, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t7/)

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### Test 8 · wrong ✗ {#t8}

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Why do sea levels rising with warming matter for coastal towns?

- **1.** Beaches will grow much wider and safer — **← Mova's choice** · no support
- **2.** Cliffs will stop eroding for good — no support
- **3.** Erosion and flooding get worse — **✓ the right answer** · no support
- **4.** Storms will vanish — 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/55-coasts-and-caves/t8/)

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### Test 9 · wrong ✗ {#t9}

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A long curved strip of sand sticks out into the sea at the end of a beach. What is it called?

- **1.** An arch — **← Mova's choice** · no support
- **2.** A stack — no support
- **3.** A stalagmite — no support
- **4.** A spit — **✓ the right answer** · 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/55-coasts-and-caves/t9/)

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### Test 10 · wrong ✗ {#t10}

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"caves r always made by waves, right" — Oli. Correct him.

- **1.** No, caves are all dug by animals — no support
- **2.** No, caves are all made by earthquakes — **← Mova's choice** · score 8
- **3.** Many big caves form inland, where rain dissolves limestone — **✓ the right answer** · score 6
- **4.** Yes, every cave is made by waves, even ones far from the sea — score 8

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 55, line 4: «Inland, caves are made in a different way: slightly acidic rain dissolves limestone. Drip by drip the water leaves stone behind, growing stalactites that hang…», reached through the remembered sentence the question matched. What matched: the same thing acted on «caves» (+5); the same action «make» (+3). The right option, 3, scored 6. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t10/)

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### Test 11 · right ✓ {#t11}

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Why do the Twelve Apostles not have twelve stacks standing today?

- **1.** Tourists broke bits off and took them home — no support
- **2.** They melted in the sun — no support
- **3.** The sea erodes them and some have collapsed — **← Mova's choice** · **✓ the right answer** · score 5
- **4.** They sank in an earthquake — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 5, the only option with support. Its support: lesson 55, line 8: «Australia's Twelve Apostles are limestone stacks that are slowly collapsing as the sea erodes them.», reached through the same lesson line as the sentence the question matched. What matched: the same action «erode» (+3); the same doer «sea» (+3). Against it: a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/t11/)

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

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Identify the principal reason for which headlands and bays are formed along a coastline.

- **1.** Resistant rock is eroded more rapidly than less resistant rock — **← Mova's choice** · no support
- **2.** Bays are excavated exclusively by human activity — no support
- **3.** Waves exert no force upon soft rock — no support
- **4.** Less resistant rock is eroded more rapidly than resistant rock — **✓ the right answer** · 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/55-coasts-and-caves/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Which of the following statements most accurately characterises the sequence of features produced by the erosion of a headland?

- **1.** Stack, arch and subsequently cave — **← Mova's choice** · no support
- **2.** Spit, bay and subsequently cave — no support
- **3.** Arch, spit and subsequently stack — no support
- **4.** Cave, arch and subsequently stack — **✓ the right answer** · 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/55-coasts-and-caves/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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Select the response that is consistent with the established facts concerning longshore drift.

- **1.** Sediment is conveyed along the coast by waves approaching at an angle — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Sediment is conveyed inland by the wind exclusively — no support
- **3.** Sediment is dissolved by acidic rainfall — no support
- **4.** Sediment is deposited solely within caverns — 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/55-coasts-and-caves/e3/)

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

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Ascertain the manner in which the majority of large caves are formed.

- **1.** By the excavation of the ground by animals — no support
- **2.** By the cooling of molten lava within mountains of volcanic origin — no support
- **3.** By the impact of meteorites — no support
- **4.** By the slow dissolution of limestone by slightly acidic rain — **← Mova's choice** · **✓ the right answer** · score 8

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 8, the only option with support. Its support: lesson 55, line 12: «Most big caves form in limestone, which slightly acidic rain slowly dissolves.», reached through the same lesson line as the sentence the question matched. What matched: the same action «dissolve» (+3); the same doer «acidic rain» (+3); the same thing acted on «limestone» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/55-coasts-and-caves/e4/)

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- ← previous: [54. Glaciers and ice ages](https://md.mova.elamur.ai/free/en/school-run/geography/54-glaciers-and-ice-ages/)
- next →: [56. Soil](https://md.mova.elamur.ai/free/en/school-run/geography/56-soil/)
- ↑ back to [Geography](https://md.mova.elamur.ai/free/en/school-run/geography/)