---
title: Identify the principal reason for which the direction of rotation of… — Water, deserts and the shape of the land · tree and pragmatics
description: Identify the principal reason for which the direction of rotation of water draining from a domestic basin is not determined by the Coriolis effect. Exam question 2 of lesson 16 «Water, deserts and the shape of the land» of the myths course of Mova's primary school, with the dependency tree and pragm
---

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# Exam question 2 · Water, deserts and the shape of the land

<!-- .ven lang=en -->
Identify the principal reason for which the direction of rotation of water draining from a domestic basin is not determined by the Coriolis effect.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you, direction, Coriolis effect · **What happens:** identify, drain, not determine · **To what, where:** principal reason, domestic basin, direction

<!-- .vabout -->
This is exam question 2 of lesson 16 «Water, deserts and the shape of the land» of the myths course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/myths/16-water-deserts-and-the-shape-of-the-land/#e2).

## The question {#question}

```conllu
# sent_id = question:myths:16-water-deserts-and-the-shape-of-the-land:e2:1
# text = Identify the principal reason for which the direction of rotation of water draining from a domestic basin is not determined by the Coriolis effect.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	20	obl	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	direction	direction	NOUN	NN	Number=Sing	20	nsubj:pass	_	_
9	of	of	ADP	IN	_	10	case	_	_
10	rotation	rotation	NOUN	NN	Number=Sing	8	nmod	_	_
11	of	of	ADP	IN	_	12	case	_	_
12	water	water	NOUN	NN	Number=Sing	8	nmod	_	_
13	draining	drain	VERB	VBG	VerbForm=Ger	8	acl	_	_
14	from	from	ADP	IN	_	17	case	_	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	_	_
16	domestic	domestic	ADJ	JJ	Degree=Pos	17	amod	_	_
17	basin	basin	NOUN	NN	Number=Sing	13	obl	_	_
18	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	20	aux:pass	_	_
19	not	not	PART	RB	Polarity=Neg	20	advmod	_	_
20	determined	determine	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl:relcl	_	_
21	by	by	ADP	IN	_	24	case	_	_
22	the	the	DET	DT	Definite=Def|PronType=Art	24	det	_	_
23	Coriolis	Coriolis	PROPN	NNP	Number=Sing	24	compound	_	_
24	effect	effect	NOUN	NN	Number=Sing	20	obl	_	SpaceAfter=No
25	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal reason |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent reason=Theme |
| 2 | **drain** | gerund | the direction of rotation of water *not said here* |  |  | a domestic basin |  |  | vn clear-10.3-1 «NP V PP.source»: agent=Theme from basin=Source |
| 3 | **not** **determine** | present · passive | the Coriolis effect | the direction of rotation of water |  |  |  | for the principal reason | vn discover-84 «NP V NP»: agent=Agent subject=Topic |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The effect operates solely upon salt water

```conllu
# sent_id = question:myths:16-water-deserts-and-the-shape-of-the-land:e2:o1:1
# text = The effect operates solely upon salt water
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	effect	effect	NOUN	NN	Number=Sing	3	nsubj	_	_
3	operates	operate	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	solely	solely	ADV	RB	_	3	advmod	_	_
5	upon	upon	ADP	IN	_	7	case	_	_
6	salt	salt	NOUN	NN	Number=Sing	7	compound	_	_
7	water	water	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **operate** | present | the effect |  |  |  |  | upon salt water; solely *property* | vn function-105.2.1-1 «NP V»: agent=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
The effect ceases in the hours of darkness

```conllu
# sent_id = question:myths:16-water-deserts-and-the-shape-of-the-land:e2:o2:1
# text = The effect ceases in the hours of darkness
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	effect	effect	NOUN	NN	Number=Sing	3	nsubj	_	_
3	ceases	cease	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	in	in	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	hours	hour	NOUN	NNS	Number=Plur	3	obl	_	_
7	of	of	ADP	IN	_	8	case	_	_
8	darkness	darkness	NOUN	NN	Number=Sing	6	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cease** | present | the effect |  |  |  | hour |  | vn stop-55.4-1-1 «NP.eventuality V»: agent=Eventuality |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The effect is far too weak at so small a scale

```conllu
# sent_id = question:myths:16-water-deserts-and-the-shape-of-the-land:e2:o3:1
# text = The effect is far too weak at so small a scale
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	effect	effect	NOUN	NN	Number=Sing	6	nsubj	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
4	far	far	ADV	RB	Degree=Pos	6	advmod	_	_
5	too	too	ADV	RB	_	6	advmod	_	_
6	weak	weak	ADJ	JJ	Degree=Pos	0	root	_	_
7	at	at	ADP	IN	_	11	case	_	_
8	so	so	ADV	RB	_	9	advmod	_	_
9	small	small	ADJ	JJ	Degree=Pos	11	amod	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
11	scale	scale	NOUN	NN	Number=Sing	6	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the effect |  |  | a small scale |  | far, weak *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
The effect is reversed within enclosed buildings

```conllu
# sent_id = question:myths:16-water-deserts-and-the-shape-of-the-land:e2:o4:1
# text = The effect is reversed within enclosed buildings
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	effect	effect	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	reversed	reverse	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	within	within	ADP	IN	_	7	case	_	_
6	enclosed	enclose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	amod	_	_
7	buildings	building	NOUN	NNS	Number=Plur	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **reverse** | present · passive |  | the effect |  |  |  | within enclosed buildings | vn other\_cos-45.4 «NP V NP.patient»: subject=Patient |
| 2 | **enclose** | participle |  |  |  |  |  |  | vn contiguous\_location-47.8 «NP V NP»: agent=Theme |

<!-- div src -->

**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

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- ← previous: [Water, deserts and the shape of the land, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/myths/16-water-deserts-and-the-shape-of-the-land/e1/)
- next →: [Water, deserts and the shape of the land, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/myths/16-water-deserts-and-the-shape-of-the-land/e3/)
- ↑ back to [Water, deserts and the shape of the land](https://md.mova.elamur.ai/free/en/corpora/questions/myths/16-water-deserts-and-the-shape-of-the-land/)