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Deep time and the story of life

Tests: 5 of 12 right · Exam: 0 of 4 right · Kind: ★★★ · Understood: 9 of 16 · Run: 2026-10-18, commit f3c23ea72

Lesson 58 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 ✓

A cartoon shows cavemen riding dinosaurs. What is wrong?

  • 1. Dinosaurs were too slow — no support
  • 2. Non-bird dinosaurs died about 66 million years before humans — ← Mova's choice · ✓ the right answer · score 5
  • 3. Cavemen were too small to ride them, but they did live side by side — no support
  • 4. Nothing, they lived together — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 58, line 4: «Plants reached land, four-legged animals crawled out, and great disasters struck: about 252 million years ago about 90% of sea species died out, and about 66 m…», reached through the same lesson line as the sentence the question matched. What matched: the same action «die out» (+3); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★★ · wrong ✗

If Earth's 4.54 billion years were one day, which came first?

  • 1. Plants on land, just after midnight — ← Mova's choice · no support
  • 2. Dinosaurs, at breakfast time — no support
  • 3. Humans, at noon — no support
  • 4. Microbes, early in the day — ✓ 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 3 · ★★★ · right ✓

A rock has half its radioactive atoms left after one half-life. After a second half-life, how much is left?

  • 1. A quarter — ← Mova's choice · ✓ the right answer · no support
  • 2. Half, still — no support
  • 3. Nothing at all — no support
  • 4. Three quarters — 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 · ★★★ · wrong ✗

Why could no animals like us live on Earth 3 billion years ago?

  • 1. It was too dark, because there was no Sun yet — no support
  • 2. The sea was made of lava — no support
  • 3. There was no water on Earth at all — ← Mova's choice · score 4
  • 4. There was almost no oxygen in the air yet — ✓ the right answer · no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 4, the only option with support. 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 doer «running water» (+2); the same place «earth» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★★ · right ✓

"dinosaurs are totally extinct, none left" — Zoe. Is she quite right?

  • 1. No, dinosaurs turned into fish — no support
  • 2. Not quite: birds are living dinosaurs; only the non-bird ones died out — ← Mova's choice · ✓ the right answer · score 5
  • 3. No, T. rex still lives in deep jungles where nobody has looked properly — no support
  • 4. Yes, every dinosaur relative is gone — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 57, line 4: «Because so few living things are buried just right, only a tiny fraction ever become fossils. Still, they tell us that many dinosaurs had feathers and that bir…», reached through the same lesson line as the sentence the question matched. What matched: the same action «live» (+3); the same doer «birds» (+3); the same thing acted on «dinosaurs» (+2). Against it: one says «not», the other does not (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 6 · ★★★ · wrong ✗

What would probably have happened if the asteroid had missed Earth 66 million years ago?

  • 1. Humans would have appeared 66 million years earlier for sure — no support
  • 2. The Earth would have stopped spinning — ← Mova's choice · score 4
  • 3. Non-bird dinosaurs might have stayed dominant and mammals stayed smaller — ✓ the right answer · no support
  • 4. Plants would never have reached land — score 3

Why: It took the question to ask what happens next. It chose option 2 with score 4, against 3 for the next best. Its support: lesson 22, line 9: «Because Earth spins, moving air and water are bent to the right in the northern hemisphere and to the left in the southern hemisphere, which is called the Cori…», reached through the option's own match among the sentences about the question's things. What matched: the same action «spin» (+2); the same doer «earth» (+2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · ★★★ · wrong ✗

Which order is right, oldest first?

  • 1. Plants on land, first microbes, oxygen, Cambrian explosion — ← Mova's choice · no support
  • 2. Oxygen, plants on land, first microbes, Cambrian explosion — no support
  • 3. Cambrian explosion, first microbes, plants on land, oxygen — no support
  • 4. First microbes, oxygen in the air, Cambrian explosion, plants on land — ✓ the right answer · 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

Test 8 · ★★★ · wrong ✗

A teacher stretches a 4.5 km rope, 1 metre for every million years. About how long is the part since the dinosaurs died?

  • 1. About 2 km of rope — ← Mova's choice · no support
  • 2. About 66 centimetres — no support
  • 3. About 66 metres — ✓ the right answer · no support
  • 4. About 4 km, almost all of it — 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 9 · ★★★ · wrong ✗

my mate goes "earth's like a few thousand years old innit". What do rocks show?

  • 1. About 4,500 years, from old books — ← Mova's choice · score 1
  • 2. About 45 million years, from fossils of the first humans — score 1
  • 3. No one can know anything about it — no support
  • 4. About 4.54 billion years, from radioactive dating — ✓ the right answer · score 1

Why: It took the question to ask what it is done to. It chose option 1 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 42, line 5: «For fifty years after Alfred Wegener said the continents move, most scientists laughed; then striped magnetic rocks on the sea floor proved him right, and toda…», reached through the remembered sentence the question matched. What matched: the same action «prove» (+3). Against it: a different thing acted on (counts against) (-2). The right option, 4, scored 1. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★★ · wrong ✗

Why was the biggest mass extinction worse than the one that ended the dinosaurs?

  • 1. It was caused by a bigger asteroid that hit the Moon — ← Mova's choice · score 5
  • 2. It wiped out about 90% of sea species — ✓ the right answer · no support
  • 3. It happened only last century — no support
  • 4. It killed only plants — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 5, the only option with support. Its support: lesson 58, line 4: «Plants reached land, four-legged animals crawled out, and great disasters struck: about 252 million years ago about 90% of sea species died out, and about 66 m…», reached through a sentence linked to the one the question matched. What matched: the same action «hit» (+3); the same doer «asteroid» (+3). Against it: a different thing acted on (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★★ · right ✓

Why did whales and elephants appear only after the dinosaurs?

  • 1. Whales hatched from dinosaurs' eggs — no support
  • 2. Elephants lived in space before that — no support
  • 3. Mammals spread into empty roles once the dinosaurs were gone — ← Mova's choice · ✓ the right answer · score 6
  • 4. Mammals did not exist at all before then, not even small ones — score 1

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 6, against 1 for the next best. Its support: lesson 58, line 15: «Mammals had lived as small animals beside the dinosaurs; after the dinosaurs, mammals spread into the empty places in nature and grew into many forms, from wha…», reached through a sentence linked to the one the question matched. What matched: the same action «spread» (+3); the same doer «mammals» (+3). · the question and its options parsed, with trees and pragmatics

Test 12 · ★★★ · right ✓

In a game, the Jurassic comes after humans built cities. What is true?

  • 1. The Jurassic is a future period that starts after the last humans have gone — no support
  • 2. The Jurassic was 2,000 years ago — no support
  • 3. The Jurassic is the period we live in now — no support
  • 4. The Jurassic was about 200-145 million years ago, long before humans — ← Mova's choice · ✓ the right answer · score 1

Why: It took the question to ask which statement is true. It chose option 4 with score 1, the only option with support. Its support: lesson 58, line 16: «Geologists call the vast span of Earth's history deep time, far longer than human history; humans appeared only about 300,000 years ago.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+1); the same circumstance (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Ascertain the age of the Earth as established by radiometric dating.

  • 1. Approximately six thousand years — ← Mova's choice · no support
  • 2. Approximately forty-five thousand million years — no support
  • 3. Approximately four million five hundred thousand years — no support
  • 4. Approximately four thousand five hundred and forty million years — ✓ 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 principle upon which the radiometric dating of rocks depends.

  • 1. The colour of rock darkens at a constant and measurable rate — ← Mova's choice · no support
  • 2. Radioactive atoms decay into other atoms at a constant rate — ✓ the right answer · no support
  • 3. Rocks increase in mass at a constant rate — no support
  • 4. Fossils within rocks multiply at a constant rate — 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 · wrong ✗

Which of the following statements most accurately characterises the Cambrian explosion?

  • 1. The impact of an asteroid upon Mexico — no support
  • 2. The first appearance of oxygen within the atmosphere — no support
  • 3. The comparatively rapid appearance of numerous animal groups possessing shells, eyes and limbs — ✓ the right answer · no support
  • 4. The volcanic eruption which extinguished the dinosaurs — ← Mova's choice · score 2

Why: It took the question to ask who or what does it. It chose option 4 with score 2, the only option with support. Its support: lesson 47, line 11: «The Laki eruption in Iceland in 1783-84 poured out poisonous gas that killed most of Iceland's livestock, and about a fifth of its people died in the famine th…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «laki eruption» (+2). Against it: a different action (counts against) (-3). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Select the response that is consistent with the established facts concerning the termination of the age of non-avian dinosaurs.

  • 1. It followed a global flood of the continents — ← Mova's choice · no support
  • 2. It followed the appearance of oxygen in the atmosphere — no support
  • 3. It followed the impact of an asteroid approximately ten kilometres in diameter in Mexico — ✓ the right answer · no support
  • 4. It followed the hunting of dinosaurs by early humans — 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/58-deep-time-and-the-story-of-life/