The Earth as a planet

Tests: 5 of 11 right · Exam: 1 of 4 right · Kind: plain · Understood: 5 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 5 of the space 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 · wrong ✗

my cousin reckons it's summer cos we're closer to the Sun then. right?

1. Yes, distance is the whole reason — ← Mova's choice · no support
2. No, summer is caused by the Moon — no support
3. Yes, and winter is when the Sun cools down — no support
4. No, summer is when our half of the Earth leans towards the Sun — ✓ 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 2 · right ✓

In fact the Earth is closest to the Sun in early January. What does that tell a person in Britain?

1. Distance cannot be what makes the seasons, since January is winter there — ← Mova's choice · ✓ the right answer · no support
2. Britain has summer in January — no support
3. The Earth stops tilting in winter — no support
4. The Sun must be cooler in January — 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 · wrong ✗

If the Earth had no tilt at all, what would happen to the seasons?

1. The seasons would swap round — ← Mova's choice · no support
2. They would almost disappear, every day of the year would be much the same — ✓ the right answer · no support
3. Summer would last all year everywhere — no support
4. Winter would last all year everywhere — 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 ✓

We are zooming round the Sun at 30 km a second, so why don't we feel it?

1. We move smoothly together with the air, like on a smooth train — ← Mova's choice · ✓ the right answer · no support
2. The Moon holds us steady — no support
3. It is only true at the equator — no support
4. We are far too heavy to feel it, so the speed cannot push us about — 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 5 · right ✓

What would happen if the Earth's magnetic field disappeared?

1. More of the solar wind would reach the atmosphere and wear it away over time — ← Mova's choice · ✓ the right answer · score 2
2. The Earth would stop spinning at once — no support
3. We would float off the ground — no support
4. The Moon would fall down — no support

Why: It took the question to ask what happens next. It chose option 1 with score 2, the only option with support. Its support: lesson 1, line 13: «Sunspots are darker, cooler patches where strong magnetic fields stop hot gas rising; they look black only because the rest of the Sun is brighter, and many ar…», reached through what followed the sentence the question matched. What matched: the same doer «strong magnetic fields» (+4). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

A cartoon shows the inside of the Earth as hollow with a little sun in the middle. What is really there?

1. Empty space with dinosaurs — ← Mova's choice · no support
2. An ocean of water — no support
3. A huge ball of ice — no support
4. A solid iron inner core inside a liquid iron outer core — ✓ 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 7 · right ✓

bro says the Earth's air was always full of oxygen since day one. true?

1. Yes, oxygen came with the Earth from the start, out of the rocks — no support
2. No, the oxygen came from the Moon — no support
3. No, living things made the oxygen over a very long time — ← Mova's choice · ✓ the right answer · score 6
4. Yes, the Sun breathes it out — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 5, line 13: «The Earth's air is about 78 percent nitrogen and 21 percent oxygen, and the oxygen was made by living things such as tiny ocean microbes and plants.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+2); the same doer «living things» (+2); the same thing acted on «oxygen» (+2). · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

Which planet is known to have moving plates of crust?

1. Only Mars — no support
2. Every rocky planet, including Venus and Mars — ← Mova's choice · score 14
3. Only the giant planets — score 14
4. Only the Earth, as far as we know — ✓ the right answer · no support

Why: It took the question to ask what it is done to. It chose option 2 with score 14, tied with another option at 14 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 5, line 7: «The Earth is the only place in the universe where we know life exists, and the only planet known to have liquid water oceans on its surface.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same action «know» (+4); the same thing acted on «only planet» (+4). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

Is the Earth a perfect ball?

1. Yes, perfectly round in every direction — ← Mova's choice · no support
2. No, it is shaped like an egg pointing at the Sun — no support
3. No, it is flat like a plate — no support
4. Almost, but it bulges slightly at the equator — ✓ 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 10 · wrong ✗

The Pale Blue Dot photo shows the Earth as a tiny speck. What does it show about the Earth?

1. How small our whole world is in the vastness of space — ✓ the right answer · no support
2. That the Earth is the only blue planet in the whole universe — ← Mova's choice · score 21
3. That the Earth is shaped like a dot — score 6
4. That the Earth is the biggest planet — score 17

Why: It took the question to ask what it is done to. It chose option 2 with score 21, against 17 for the next best. Its support: lesson 5, line 7: «The Earth is the only place in the universe where we know life exists, and the only planet known to have liquid water oceans on its surface.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same doer «earth» (+5); the same thing acted on «only place» (+4); the same place «universe» (+4). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 11 · right ✓

2028 has a 29 February. Why don't we just have 365 days every year?

1. The Earth takes about 365 and a quarter days to orbit, so the extra quarters add up — ← Mova's choice · ✓ the right answer · no support
2. 29 February is a holiday that was added for fun — no support
3. The Moon's phases need an extra day — no support
4. Leap days stop the Earth from tilting — 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

Exam question 1 · formal language · wrong ✗

Identify the cause of the seasonal variation experienced upon the Earth.

1. The interposition of the Moon between the Earth and the Sun — ← Mova's choice · no support
2. The inclination of the Earth's axis of rotation — ✓ the right answer · no support
3. The variation in the distance of the Earth from the Sun — no support
4. The periodic variation in the output of the Sun — 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 ✗

Ascertain the origin of the Earth's magnetic field.

1. The gravitational influence of the Moon — ← Mova's choice · no support
2. A permanent magnet situated at the geographic North Pole — no support
3. Electrical discharges within the atmosphere — no support
4. The motion of liquid iron within the outer core — ✓ 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

Exam question 3 · formal language · right ✓

Which of the following statements most accurately characterises the composition of the Earth's atmosphere?

1. Approximately seventy-eight per cent nitrogen and twenty-one per cent oxygen — ← Mova's choice · ✓ the right answer · no support
2. Predominantly carbon dioxide with traces of nitrogen — no support
3. Predominantly oxygen with traces of nitrogen — no support
4. Predominantly hydrogen and helium — 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

Exam question 4 · formal language · wrong ✗

Select the response consistent with the established facts concerning the Earth among the rocky planets.

1. It is the smallest of the four rocky planets — ← Mova's choice · score 10
2. It is the largest of the four and the only one known to support life — ✓ the right answer · no support
3. It is the rocky planet nearest the Sun — score 10
4. It is one of several rocky planets known to support life — score 10

Why: It took the question to ask which statement is true. It chose option 1 with score 10, tied with another option at 10 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 5, line 1: «Our Earth is the third planet from the Sun, a rocky ball like Mercury, Venus and Mars, but the biggest of the four and the only one we know with life.», reached through the remembered sentence the question matched. What matched: the same doer «earth» (+4); the same circumstance (+4); the same light verb (be, have, do, get, go) (+2). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/space/5-the-earth-as-a-planet/