Weather: pressure, wind, clouds and storms

Tests: 6 of 13 right · Exam: 2 of 4 right · Kind: plain · Understood: 9 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 15 of the world 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 ✓

You see a flash and count six seconds before the thunder. About how far away was the lightning?

1. About two kilometres — ← Mova's choice · ✓ the right answer · no support
2. About twenty kilometres — no support
3. About six kilometres — no support
4. Right above your head — 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 · wrong ✗

A weather report says the air pressure is falling fast. What weather is likely?

1. A completely still day — ← Mova's choice · no support
2. A long sunny spell — no support
3. Clouds, wind and rain — ✓ the right answer · no support
4. Clearer skies than before — 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 ✗

Why does air rush out of an untied balloon?

1. The air inside is cooler than the air outside, so it escapes — score 4
2. Air always moves upwards — ← Mova's choice · score 7
3. It moves from high pressure inside to lower pressure outside — ✓ the right answer · score 7
4. The rubber pulls air in from outside — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 15, line 3: «Wind is air moving from places where the pressure is high to places where it is low, like air rushing out of an untied balloon.», reached through the option's own match among the sentences about the question's things. What matched: the same action «move» (+4); the same doer «air» (+3). The right option, 3, scored 7. · the question and its options parsed, with trees and pragmatics

Test 4 · right ✓

Which is true about thunder?

1. It is the sound made by lightning — ← Mova's choice · ✓ the right answer · score 10
2. It is the sound of the wind breaking — score 10
3. It is made by heavy rain on the roof — no support
4. It comes from clouds hitting each other — no support

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 15, line 13: «Lightning is a giant electric spark; thunder is the sound of the air it heats suddenly bursting outward.», reached through the remembered sentence the question matched. What matched: the same doer «thunder» (+4); the same thing acted on «sound» (+4); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics

Test 5 · wrong ✗

On a hot summer afternoon a tall dark cloud grows very quickly. What might it bring?

1. Thick fog like on a cold winter morning — no support
2. Clear, calm air and a bright, cloudless blue sky — ← Mova's choice · score 4
3. A thunderstorm with heavy rain or hail — ✓ the right answer · no support
4. A light and gentle fall of soft snowflakes — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 4, the only option with support. Its support: lesson 15, line 12: «Hail is balls of ice that grow in tall storm clouds, carried up and down by strong winds.», 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 thing acted on «balls» (+2). Against it: a different doer (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

If light and sound travelled at the same speed, what would you notice in a storm?

1. Lightning would become invisible — no support
2. You would hear the thunder at the same moment as the flash — ← Mova's choice · ✓ the right answer · score 7
3. You would never hear thunder at all — score 4
4. You would hear the thunder before the flash — score 7

Why: It took the question to ask what it is done to. It chose option 2 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 15, line 6: «For example, you see the flash before you hear the thunder, because light travels much faster than sound.», 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 action «hear» (+2); the same thing acted on «thunder» (+2). · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Which tool would tell you whether the wind is blowing from the north?

1. A barometer — ← Mova's choice · no support
2. A wind vane — ✓ the right answer · no support
3. A thermometer — no support
4. A rain gauge — 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 · right ✓

Why does it sometimes snow instead of rain?

1. The cloud is very old — no support
2. The cloud floats very high above the sea, where the air is always thin and dry — no support
3. The air is cold enough for the ice crystals to stay frozen as they fall — ← Mova's choice · ✓ the right answer · score 1
4. The wind is very strong — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 1, the only option with support. Its support: lesson 14, line 14: «When seawater evaporates the salt stays behind, so rain is fresh water.», reached through the cause of the sentence the question matched. What matched: the same action «stay» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

Which sentence describes the weather?

1. The poles are always cold — ← Mova's choice · no support
2. Deserts are dry most of the year — no support
3. It is raining in our town this morning — ✓ the right answer · no support
4. Our country has cold winters every year — 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 ✗

lightning just went, how far away is it if thunder came 6 secs later

1. About 6 kilometres — ← Mova's choice · no support
2. About 2 kilometres — ✓ the right answer · no support
3. About 18 kilometres — no support
4. Right above us — 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 11 · right ✓

wots a barometer for

1. Measuring rainfall — no support
2. Measuring air pressure — ← Mova's choice · ✓ the right answer · score 4
3. Showing which way the wind blows — no support
4. Measuring temperature — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 4, the only option with support. Its support: lesson 15, line 16: «A thermometer measures temperature, a barometer measures air pressure, a rain gauge measures rainfall and a wind vane shows the direction of the wind.», reached through the option's own match among the sentences about the question's things. What matched: the same action «measure» (+2); the same thing acted on «air pressure» (+2). · the question and its options parsed, with trees and pragmatics

Test 12 · wrong ✗

Leo says thunder is two clouds bumping into each other. true?

1. Yes, it's ice in the clouds cracking — score 3
2. No, it's the wind hitting the ground — no support
3. Yes, clouds crash together and make the boom — ← Mova's choice · score 8
4. No, it's air heated by lightning suddenly bursting outward — ✓ the right answer · score 8

Why: It took the question to ask which statement is true. It chose option 3 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 15, line 4: «Clouds form when moist air rises and cools; when the droplets grow heavy they fall as rain, and when the cloud is cold enough the water falls as snow or hail.», reached through the remembered sentence the question matched. What matched: the same action «form» (+4); the same doer «clouds» (+4). The right option, 4, scored 8. · the question and its options parsed, with trees and pragmatics

Test 13 · right ✓

a teacher said wind blows from low pressure to high, did she mean it the other way?

1. Yes, wind blows from high pressure to low pressure — ← Mova's choice · ✓ the right answer · score 12
2. Yes, wind blows from hot to cold places only — score 8
3. No, wind really blows from low to high — no support
4. No, wind does not depend on pressure — score 6

Why: It took the question to ask which statement is true. It chose option 1 with score 12, against 8 for the next best. Its support: lesson 15, line 9: «Wind blows from high pressure towards low pressure.», reached through the remembered sentence the question matched. What matched: the same action «blow» (+4); the same doer «wind» (+4); the same circumstance (+4). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Which of the following statements most accurately characterises the movement of wind?

1. It proceeds from regions of low pressure towards regions of high pressure — ← Mova's choice · no support
2. It proceeds from the sea towards the land at all times — no support
3. It proceeds invariably from north to south — no support
4. It proceeds from regions of high pressure towards regions of low pressure — ✓ 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 · right ✓

Identify the principal reason for which lightning is perceived before thunder.

1. Sound is obstructed by the clouds — no support
2. The eyes respond faster than the ears — no support
3. Thunder is produced some time after lightning — no support
4. Light travels considerably faster than sound — ← Mova's choice · ✓ the right answer · score 5

Why: It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 15, line 6: «For example, you see the flash before you hear the thunder, because light travels much faster than sound.», reached through the same lesson line as the sentence the question matched. What matched: the same action «travel» (+2); the same doer «light» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

It is given that thunder is heard nine seconds after lightning is seen. Ascertain the approximate distance of the storm.

1. Three kilometres — ← Mova's choice · ✓ the right answer · no support
2. One kilometre — no support
3. Nine kilometres — no support
4. Twenty-seven kilometres — 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 · wrong ✗

Identify the instrument employed for the measurement of air pressure.

1. A wind vane — ← Mova's choice · no support
2. A rain gauge — no support
3. A thermometer — no support
4. A barometer — ✓ 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

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/world/15-weather/