Minerals and crystals
Tests: 5 of 10 right · Exam: 2 of 4 right · Kind: ★★ · Understood: 6 of 14 · Run: 2026-10-18, commit f3c23ea72
Lesson 50 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.
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.
Test 1 · ★★ · right ✓
"found gold in the stream!!! shiny cubes, gonna be rich" What should you check first?
- 1. Whether it floats, gold floats — no support
- 2. Whether it smells of eggs, gold does — no support
- 3. Its streak and hardness: shiny cubes are probably pyrite — ← Mova's choice · ✓ the right answer · score 6
- 4. Nothing, all shiny yellow rock is gold, so start spending — score 6
Why: It took the question to ask what it is done to. It chose option 3 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 33, line 16: «Francisco Pizarro captured the Inca emperor Atahualpa in 1532 and had him killed in 1533, even after a huge ransom of gold and silver was paid.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «gold» (+2). · the question and its options parsed, with trees and pragmatics
Test 2 · ★★ · wrong ✗
Your friend says: "Every rock is a mineral." Put her right.
- 1. She's right, rock and mineral mean the same — no support
- 2. Rocks are usually mixtures of minerals, like granite of quartz, feldspar and mica — ✓ the right answer · no support
- 3. Minerals are only found in jewellery — no support
- 4. Minerals are made of rocks, not the other way round, so every mineral is a rock — ← Mova's choice · score 8
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 50, line 9: «Quartz is one of the most common minerals, made of silicon and oxygen, and most sand is quartz.», reached through the remembered sentence the question matched. What matched: the same thing acted on «common minerals» (+5); the same action «make» (+3). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 3 · ★★ · wrong ✗
A mystery mineral scratches glass but is scratched by quartz. What can you say about it?
- 1. It must be talc — ← Mova's choice · no support
- 2. It is harder than quartz and softer than glass — no support
- 3. It must be diamond, the hardest of all — no support
- 4. It is softer than quartz but harder than glass — ✓ the right answer · no support
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
Test 4 · ★★ · right ✓
What would happen if you let a saucer of salty water evaporate on a windowsill?
- 1. The salt would slowly turn into quartz — score 2
- 2. Nothing, salt disappears with the water — no support
- 3. The water would turn into tiny ice crystals — score 2
- 4. Small cube-shaped salt crystals would grow — ← Mova's choice · ✓ the right answer · score 8
Why: It took the question to ask what happens next. It chose option 4 with score 8, against 2 for the next best. Its support: lesson 50, line 3: «Sprinkle salt into warm water, leave the saucer on a sunny windowsill for a week, and tiny cubes appear as the water evaporates; crystals grow by adding atoms…», reached through what followed the sentence the question matched. What matched: the same action «grow» (+4); the same doer «crystals» (+4). · the question and its options parsed, with trees and pragmatics
Test 5 · ★★ · wrong ✗
"two yellow shiny rocks same size, one's way heavier. which is gold?"
- 1. The one that sparkles more in the sun — ← Mova's choice · no support
- 2. The lighter one; gold is a very light metal, like foil — no support
- 3. They weigh the same, you can't tell — no support
- 4. The heavier one; gold is much heavier than pyrite — ✓ the right answer · no support
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
Test 6 · ★★ · wrong ✗
A cartoon miner scratches a diamond with his fingernail. What's wrong?
- 1. Diamond can only ever be scratched by gold, not by nails — ← Mova's choice · no support
- 2. Fingernails are harder than any mineral — no support
- 3. Diamond is the hardest mineral; a fingernail can't scratch it — ✓ the right answer · no support
- 4. Nothing, diamond is soft like talc — no support
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
Test 7 · ★★ · right ✓
A crystal and a piece of glass both look clear. What is the real difference inside?
- 1. The crystal's atoms are in a repeating pattern; the glass's are jumbled — ← Mova's choice · ✓ the right answer · no support
- 2. The crystal is liquid inside — no support
- 3. The glass has a pattern; the crystal is jumbled — no support
- 4. There is no difference at all — no support
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
Test 8 · ★★ · wrong ✗
How could deep layers of rock salt end up under dry land in England?
- 1. An ancient sea there dried up and left its salt behind — ✓ the right answer · no support
- 2. Rain carried salt down from the clouds — no support
- 3. Salt lorries buried it there long ago to store it for winter — ← Mova's choice · score 5
- 4. It froze out of underground ice — no support
Why: It took the question to ask what something is like. It chose option 3 with score 5, the only option with support. Its support: lesson 43, line 6: «About 300-200 million years ago almost all land was joined in one supercontinent called Pangaea.», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same thing acted on «land» (+2); the same property (+1). Against it: a different action (counts against) (-1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 9 · ★★ · right ✓
Why did the Naica crystals grow so huge?
- 1. They grew very slowly for a very long time in warm mineral water — ← Mova's choice · ✓ the right answer · score 5
- 2. Someone glued lots of small crystals together — no support
- 3. They were made in a factory and hidden there — score 2
- 4. They all grew in a single night after a big earthquake shook the cave — score 4
Why: It took the question to ask why something happens (its cause). It chose option 1 with score 5, against 4 for the next best. Its support: lesson 48, line 3: «Think of a granite kitchen worktop with its speckles of grey, pink and black; each speckle is a crystal that grew slowly for thousands of years kilometres unde…», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+2); the same doer «grey crystal» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics
Test 10 · ★★ · right ✓
Leo says quartz is a rare gem you only find in shops. What's true?
- 1. Quartz is only found on the Moon — no support
- 2. Quartz is one of the most common minerals, and most sand is quartz — ← Mova's choice · ✓ the right answer · score 6
- 3. Quartz doesn't occur naturally at all, it is only made in factories — no support
- 4. He's right, it's rarer than diamond — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 6, the only option with support. Its support: lesson 50, line 9: «Quartz is one of the most common minerals, made of silicon and oxygen, and most sand is quartz.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «most sand» (+3); the same thing acted on «quartz» (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Which of the following statements most accurately characterises a mineral?
- 1. A manufactured solid of variable composition — ← Mova's choice · no support
- 2. A naturally occurring liquid of fixed chemical composition — no support
- 3. Any solid substance extracted from the ground irrespective of composition — no support
- 4. A naturally occurring solid of fixed chemical composition with an ordered atomic structure — ✓ the right answer · no support
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
Exam question 2 · formal language · wrong ✗
Identify the property ranked by the Mohs scale.
- 1. Age, as determined by radioactive decay — ← Mova's choice · no support
- 2. Hardness, as determined by the capacity of one mineral to scratch another — ✓ the right answer · no support
- 3. Lustre, as determined by the reflection of light from the surface of the specimen — no support
- 4. Density, as determined by weighing in water — no support
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
Exam question 3 · formal language · right ✓
It is given that a yellow metallic specimen leaves a black streak upon an unglazed tile. Ascertain its most probable identity.
- 1. Pyrite — ← Mova's choice · ✓ the right answer · no support
- 2. White talc — no support
- 3. Halite salt — no support
- 4. Pure gold — no support
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
Exam question 4 · formal language · right ✓
Select the response that is consistent with the established facts concerning the formation of halite deposits.
- 1. They were formed by the evaporation of ancient seas — ← Mova's choice · ✓ the right answer · no support
- 2. They were formed by the cooling and crystallisation of basaltic lava — no support
- 3. They were formed by the metamorphism of slate — no support
- 4. They were formed by the compaction of shells — no support
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
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/geography/50-minerals-and-crystals/