Rivers shaping the land

Tests: 7 of 11 right · Exam: 0 of 4 right · Kind: ★ · Understood: 10 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 53 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 ✓

Why does a river cut a V-shaped valley up in the hills but wind in loops near the sea?

1. It is steep and fast near the source, slower and flatter lower down — ← Mova's choice · ✓ the right answer · score 6
2. Fish make the loops near the sea — no support
3. The wind blows the river into loops — no support
4. It is colder in the hills and warmer by the sea, so the water bends — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, the only option with support. Its support: lesson 53, line 2: «High up, the river is fast and steep and cuts down into the land, making a deep V-shaped valley. Where it pours over a band of hard rock lying on soft rock, th…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «river» (+3); the same property (+3). · the question and its options parsed, with trees and pragmatics

Test 2 · ★ · right ✓

"rivers start at the sea and flow up into the mountains" — Jack's little brother. What is right?

1. Rivers flow both ways at once — score 5
2. Rivers flow uphill in the morning only, then back down at night — score 5
3. Rivers flow downhill from their source to their mouth — ← Mova's choice · ✓ the right answer · score 8
4. Rivers flow only in winter — score 5

Why: It took the question to ask which statement is true. It chose option 3 with score 8, against 5 for the next best. Its support: lesson 53, line 5: «A river flows from its source in the hills to its mouth at the sea, a lake or another river.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «river» (+3); the same action «flow» (+2); the same place «source» (+2); the same circumstance (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · right ✓

A geologist finds a curved, horseshoe-shaped lake beside a winding river. What is it most likely?

1. An oxbow lake, a cut-off meander — ← Mova's choice · ✓ the right answer · no support
2. A spring bubbling up at the river's source — no support
3. A pool dug by a glacier — no support
4. A crater from a meteorite — 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 ✓

Hard rock sits on soft rock where a river drops. What will happen to the waterfall over time?

1. It will slowly move back upstream — ← Mova's choice · ✓ the right answer · score 4
2. It will turn into a delta — no support
3. It will stay in exactly the same place — no support
4. It will slowly climb uphill — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 53, line 7: «Waterfalls form where a river flows over hard rock lying on top of softer rock, and as the soft rock wears away the waterfall slowly moves back upstream.», reached through the same lesson line as the sentence the question matched. What matched: the same action «move back» (+3); the same property (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · right ✓

What would happen to a delta if the sea's waves and currents became much stronger?

1. The delta would become a mountain — no support
2. The sea might carry the sediment away and the delta could shrink — ← Mova's choice · ✓ the right answer · score 4
3. The delta would grow much faster, as the waves push more mud onto it — score 4
4. The river would flow backwards — score 4

Why: It took the question to ask what happens next. It chose option 2 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 53, line 11: «A delta forms where a river drops its sediment at the mouth faster than the sea can carry it away.», reached through the option's own match among the sentences about the question's things. What matched: the same action «carry away» (+2); the same doer «sea» (+2); the same property (+1). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

mate: "why'd ancient farmers live right next to rivers, they'd just get flooded, thick or what" — what's the best reason?

1. Floods left fertile mud, so the land grew good crops — ← Mova's choice · ✓ the right answer · score 1
2. Floods never happened in ancient times — no support
3. River land was always dry and safe — no support
4. The rivers kept animals away — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 1, the only option with support. Its support: lesson 27, line 18: «Farmers who grow crops like cocoa and coffee often earn very little of the price paid in shops, because most of it goes to traders, factories, brands and shops.», reached through the option's own match among the sentences about the question's things. What matched: the same action «grow» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

In a cartoon, a river carves a canyon a mile deep in one afternoon. What is wrong?

1. Canyons form only under the sea — no support
2. Canyons are dug by people — no support
3. Canyons are made by the wind blowing sand, never by rivers — ← Mova's choice · score 7
4. Canyons like the Grand Canyon take millions of years — ✓ the right answer · no support

Why: It took the question to ask which statement is true. It chose option 3 with score 7, the only option with support. Its support: lesson 53, line 4: «Floods spread mud on flat land beside the river, making a fertile flood plain, and at the mouth the river may drop its mud to build a delta. Over millions of y…», reached through the remembered sentence the question matched. What matched: the same thing acted on «grand canyon» (+5); the same circumstance (+4). Against it: a different action (counts against) (-2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

Why does a river flowing into a calm sea build a delta while one flowing into a stormy sea may not?

1. Calm seas push rivers backwards — score 1
2. Calm seas cannot carry the sediment away fast enough — ← Mova's choice · ✓ the right answer · score 2
3. Stormy seas freeze the sediment — no support
4. Stormy seas have no salt — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 2, against 1 for the next best. Its support: lesson 53, line 11: «A delta forms where a river drops its sediment at the mouth faster than the sea can carry it away.», reached through the option's own match among the sentences about the question's things. What matched: the same action «carry away» (+2); the same doer «sea» (+2); the same property (+1). Against it: one says «not», the other does not (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

Why are big river floods so deadly?

1. Flood water is boiling hot — ← Mova's choice · no support
2. Floods happen without any water — no support
3. Rivers flood only in empty deserts, far from any towns — no support
4. Many people live and farm on the flat land beside rivers — ✓ 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 ✗

Which word fits: the Thames meets the tide in a wide mouth where London's port grew.

1. Source spring — ← Mova's choice · no support
2. Oxbow lake — no support
3. Estuary — ✓ the right answer · no support
4. Delta plain — 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 · ★ · wrong ✗

Which order goes from source to mouth?

1. V-shaped valley, meanders, mouth — ✓ the right answer · no support
2. Meanders, source, V-shaped valley — no support
3. Mouth, meanders, source — no support
4. Delta, waterfall, source — ← Mova's choice · score 11

Why: It took the question to ask who or what does it. It chose option 4 with score 11, the only option with support. Its support: lesson 53, line 5: «A river flows from its source in the hills to its mouth at the sea, a lake or another river.», reached through the remembered sentence the question matched. What matched: the same circumstance (+6); the same place «source» (+4); a different doer (counts against) (+1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal reason for which a waterfall forms in the course of a river.

1. Aquatic creatures excavate the riverbed — ← Mova's choice · no support
2. A stratum of resistant rock overlies a less resistant stratum — ✓ the right answer · no support
3. The river is subjected to a sudden decrease in temperature — no support
4. The river attains its greatest width — 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 ✗

Which of the following statements most accurately characterises the formation of an oxbow lake?

1. A volcanic crater becomes filled with rain — ← Mova's choice · no support
2. A glacier excavates a circular basin which subsequently fills with meltwater — no support
3. A river is impounded by a dam near its source — no support
4. A river breaches the narrow neck of a meander and abandons the loop — ✓ 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 3 · formal language · wrong ✗

Select the response that is consistent with the established facts concerning flood plains.

1. They are level lands built of deposited silt and are highly fertile — ✓ the right answer · score 5
2. They are formed exclusively by wind — ← Mova's choice · score 8
3. They are deserts devoid of sediment — no support
4. They are steep slopes of bare rock — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 5 for the next best. Its support: lesson 53, line 4: «Floods spread mud on flat land beside the river, making a fertile flood plain, and at the mouth the river may drop its mud to build a delta. Over millions of y…», reached through the remembered sentence the question matched. What matched: the same thing acted on «fertile flood plain» (+5); the same action «make» (+3). The right option, 1, scored 5. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Ascertain the conditions under which a delta is formed at the mouth of a river.

1. The river flows uphill towards its mouth — ← Mova's choice · score 6
2. Sediment is deposited faster than the sea is able to remove it — ✓ the right answer · no support
3. The sea deposits sediment into the source of the river from its mouth — score 1
4. The river is entirely frozen throughout the year — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 1 for the next best. Its support: lesson 53, line 5: «A river flows from its source in the hills to its mouth at the sea, a lake or another river.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «river» (+3); the same action «flow» (+2); the same circumstance (+1). 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/geography/53-rivers-shaping-the-land/