---
title: Igneous rocks and the rock cycle — how Mova does on the tests · Geography
description: Lesson 48 of the geography course of Mova's primary school: 5 of 10 tests right, exam 1 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/school-run/geography/48-igneous-rocks-and-the-rock-cycle/)

<!-- crumbs -->
[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/) / 48

# Igneous rocks and the rock cycle

<!-- .vintro -->
**Tests:** 5 of 10 right · **Exam:** 1 of 4 right · **Kind:** plain · **Understood:** 8 of 14 · **Run:** 2026-10-18, commit `f3c23ea72`

<!-- .vabout -->
Lesson 48 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/48-igneous-rocks-and-the-rock-cycle/).

<!-- .vabout -->
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/48-igneous-rocks-and-the-rock-cycle/).

<!-- div qa ok -->

### Test 1 · right ✓ {#t1}

<!-- .q -->
Ella's granite worktop has big speckles. Her brother says it cooled fast in a volcano's lava. Put him right.

- **1.** Granite is made of glued-together sand — no support
- **2.** Granite has no crystals at all — no support
- **3.** Big crystals mean it cooled slowly deep underground — **← Mova's choice** · **✓ the right answer** · score 5
- **4.** He's right, fast cooling in lava always makes big crystals — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 48, line 11: «Obsidian is natural glass that forms when lava cools so fast that no crystals can grow.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «lava» (+3); the same action «cool» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/48-igneous-rocks-and-the-rock-cycle/t1/)

<!-- /div -->

<!-- div qa no -->

### Test 2 · wrong ✗ {#t2}

<!-- .q -->
"found a rock that floats in the bath lol, is it fake?"

- **1.** It's probably pumice, real rock full of gas bubbles — **✓ the right answer** · no support
- **2.** It's obsidian, the glassy rock that floats — no support
- **3.** It's granite with lots of air trapped inside it — **← Mova's choice** · score 3
- **4.** It must be plastic, real rocks can never float — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 3 with score 3, the only option with support. Its support: lesson 27, line 9: «Much of the world's oil comes from a few places, such as the Middle East, the USA, Russia and Venezuela, because oil formed long ago from the remains of tiny s…», reached through the option's own match among the sentences about the question's things. What matched: the same action «trap» (+2); the same place «special rocks» (+2). Against it: a different thing acted on (counts against) (-1). The right option, 1, 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/48-igneous-rocks-and-the-rock-cycle/t2/)

<!-- /div -->

<!-- div qa no -->

### Test 3 · wrong ✗ {#t3}

<!-- .q -->
In a fantasy film, a black glassy stone is called "dragonglass". What is it in real life?

- **1.** Coal pressed into glass — **← Mova's choice** · no support
- **2.** Granite polished very smooth — no support
- **3.** Basalt, the rock of the ocean floor — no support
- **4.** Obsidian, lava that cooled too fast for crystals — **✓ the right answer** · no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/t3/)

<!-- /div -->

<!-- div qa no -->

### Test 4 · wrong ✗ {#t4}

<!-- .q -->
What would happen to the rock cycle if the Earth's inside went completely cold?

- **1.** No melting or squeezing deep down, so new igneous and metamorphic rock would stop — **✓ the right answer** · no support
- **2.** The Sun would take over and melt all the rocks from above instead of from below — no support
- **3.** Nothing at all would change — **← Mova's choice** · score 4
- **4.** Rocks would start melting faster — no support

<!-- .why -->
**Why:** It took the question to ask what happens next. It chose option 3 with score 4, the only option with support. Its support: lesson 48, line 15: «In the rock cycle, rocks are worn down into bits that make sedimentary rock, changed by heat and pressure into metamorphic rock, or melted and cooled into igne…», reached through what followed the sentence the question matched. What matched: the same action «change» (+4). The right option, 1, 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/48-igneous-rocks-and-the-rock-cycle/t4/)

<!-- /div -->

<!-- div qa ok -->

### Test 5 · right ✓ {#t5}

<!-- .q -->
Mia says: "A rock is a rock for ever, it never changes." What's true?

- **1.** Only igneous rocks can change — no support
- **2.** Rocks change into other kinds of rock every few weeks, after heavy rain — no support
- **3.** She's right, rocks never change at all — no support
- **4.** Over millions of years rocks are worn, squeezed or melted into other rocks — **← Mova's choice** · **✓ the right answer** · score 4

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 41, line 8: «The mantle is about 2,900 km thick and is solid rock, but over millions of years it slowly flows like very stiff putty; only small pockets of it melt into runn…», reached through the option's own match among the sentences about the question's things. What matched: the same action «melt» (+2); the same place «runny rock» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/48-igneous-rocks-and-the-rock-cycle/t5/)

<!-- /div -->

<!-- div qa no -->

### Test 6 · wrong ✗ {#t6}

<!-- .q -->
Two pieces of rock from the same volcano: one has tiny crystals, one is glassy. Why the difference?

- **1.** The glassy one was made of sand — no support
- **2.** They came from different planets — no support
- **3.** The glassy one cooled slowly underground — **← Mova's choice** · score 5
- **4.** The glassy one cooled even faster — **✓ the right answer** · score 5

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 3 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 48, line 7: «Rock that cools slowly underground has big crystals, while lava that cools fast on the surface has tiny crystals.», reached through the same lesson line as the sentence the question matched. What matched: the same action «cool» (+3); the same property (+2). 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/48-igneous-rocks-and-the-rock-cycle/t6/)

<!-- /div -->

<!-- div qa ok -->

### Test 7 · right ✓ {#t7}

<!-- .q -->
"is sedimentary rock basically just rocks made by volcanoes?"

- **1.** Yes, all rocks come from volcanoes in the end — no support
- **2.** No, volcanoes make igneous rock; sedimentary is pressed-together bits — **← Mova's choice** · **✓ the right answer** · score 8
- **3.** No, sedimentary rocks are made by plants growing and dying on top of them — score 8
- **4.** Yes, but only the dark ones — no support

<!-- .why -->
**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 48, line 8: «Granite is a speckled igneous rock with big crystals of quartz, feldspar and mica, formed deep underground.», reached through the remembered sentence the question matched. What matched: the same thing acted on «speckled igneous rock» (+5); the same action «form» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/48-igneous-rocks-and-the-rock-cycle/t7/)

<!-- /div -->

<!-- div qa ok -->

### Test 8 · right ✓ {#t8}

<!-- .q -->
Your little brother thinks the ocean floor is made of sand all the way down. What lies under the mud and sand?

- **1.** Mostly basalt from runny lava — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Mostly granite with big crystals — no support
- **3.** Mostly chalk made of shells — no support
- **4.** Mostly ice — no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/t8/)

<!-- /div -->

<!-- div qa ok -->

### Test 9 · right ✓ {#t9}

<!-- .q -->
Why can't you watch one full trip round the rock cycle in your lifetime?

- **1.** It only happens at night — no support
- **2.** It stopped long ago — no support
- **3.** It happens far too deep for anyone to ever see — no support
- **4.** It usually takes millions of years — **← Mova's choice** · **✓ the right answer** · score 3

<!-- .why -->
**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 48, line 17: «One trip around the rock cycle usually takes millions of years.», reached through the option's own match among the sentences about the question's things. What matched: the same action «take» (+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/48-igneous-rocks-and-the-rock-cycle/t9/)

<!-- /div -->

<!-- div qa no -->

### Test 10 · wrong ✗ {#t10}

<!-- .q -->
A pebble of basalt is ground into sand by waves. Which family could that sand become part of next?

- **1.** Igneous rock straight away — **← Mova's choice** · no support
- **2.** Sedimentary rock — **✓ the right answer** · no support
- **3.** No rock ever again — no support
- **4.** Metal ore — no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/t10/)

<!-- /div -->

<!-- div qa no -->

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

<!-- .q -->
Which of the following statements most accurately characterises the formation of igneous rocks?

- **1.** They are formed by the accumulation of the shells of marine organisms — **← Mova's choice** · no support
- **2.** They are formed by the alteration of rock by heat and pressure without melting — no support
- **3.** They are formed by the cementation of compacted sediment — no support
- **4.** They are formed by the cooling and solidification of molten rock — **✓ the right answer** · no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/e1/)

<!-- /div -->

<!-- div qa no -->

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

<!-- .q -->
Identify the principal factor determining the dimensions of the crystals within an igneous rock.

- **1.** The colour of the molten rock prior to cooling — **← Mova's choice** · no support
- **2.** The age of the surrounding sedimentary strata — no support
- **3.** The quantity of sunlight received by the rock — no support
- **4.** The rate at which the molten rock cooled — **✓ the right answer** · no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/e2/)

<!-- /div -->

<!-- div qa ok -->

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

<!-- .q -->
Select the response that is consistent with the established facts concerning the sources of energy which drive the rock cycle.

- **1.** The gravitational attraction of the Moon exclusively — no support
- **2.** The energy of the Sun at the surface and the internal heat of the Earth — **← Mova's choice** · **✓ the right answer** · score 6
- **3.** The kinetic energy of the wind, acting exclusively upon the surface — score 3
- **4.** The chemical energy released by plants in the soil — no support

<!-- .why -->
**Why:** It took the question to ask which statement is true. It chose option 2 with score 6, against 3 for the next best. Its support: lesson 48, line 5: «The Sun drives the outside of the cycle with weather, rain and rivers that wear rock down, and the Earth's inner heat drives the inside by melting and squeezin…», reached through the same lesson line as the sentence the question matched. What matched: the same action «heat» (+3); the same doer «earth» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/geography/48-igneous-rocks-and-the-rock-cycle/e3/)

<!-- /div -->

<!-- div qa no -->

### Exam question 4 · formal language · wrong ✗ {#e4}

<!-- .q -->
It is given that a specimen of volcanic rock floats upon water. Ascertain the most probable identity of the specimen.

- **1.** Obsidian — **← Mova's choice** · no support
- **2.** Pumice — **✓ the right answer** · no support
- **3.** Dense basalt — no support
- **4.** Granite — no support

<!-- .why -->
**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/48-igneous-rocks-and-the-rock-cycle/e4/)

<!-- /div -->

<!-- pn -->
- ← previous: [47. Famous eruptions and living with volcanoes](https://md.mova.elamur.ai/free/en/school-run/geography/47-famous-eruptions-and-living-with-volcanoes/)
- next →: [49. Sedimentary and metamorphic rocks](https://md.mova.elamur.ai/free/en/school-run/geography/49-sedimentary-and-metamorphic-rocks/)
- ↑ back to [Geography](https://md.mova.elamur.ai/free/en/school-run/geography/)