---
title: It is given that the Earth turns 15 degrees of longitude every hour.… — Explorers and how the world was mapped · tree and pragmatics
description: It is given that the Earth turns 15 degrees of longitude every hour. Determine the difference in longitude between two places whose local times differ by two hours. Exam question 4 of lesson 98 «Explorers and how the world was mapped» of the world course of Mova's primary school, with the dependency
---

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# Exam question 4 · Explorers and how the world was mapped

<!-- .ven lang=en -->
It is given that the Earth turns 15 degrees of longitude every hour. Determine the difference in longitude between two places whose local times differ by two hours.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** Earth, you, local times · **What happens:** give, turn, determine, differ · **To what, where:** It, 15 degrees, difference, longitude

<!-- .vabout -->
This is exam question 4 of lesson 98 «Explorers and how the world was mapped» of the world 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/world/98-explorers-mapping-the-world/#e4).

## The question {#question}

<!-- .note -->
*Sentence 1:* It is given that the Earth turns 15 degrees of longitude every hour.

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:1
# text = It is given that the Earth turns 15 degrees of longitude every hour.
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	that	that	SCONJ	IN	_	7	mark	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	Earth	Earth	PROPN	NNP	Number=Sing	7	nsubj	_	_
7	turns	turn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	advcl	_	_
8	15	15	NUM	CD	NumForm=Digit|NumType=Card	9	nummod	_	_
9	degrees	degree	NOUN	NNS	Number=Plur	7	obj	_	_
10	of	of	ADP	IN	_	11	case	_	_
11	longitude	longitude	NOUN	NN	Number=Sing	9	nmod	_	_
12	every	every	DET	DT	PronType=Tot	13	det	_	_
13	hour	hour	NOUN	NN	Number=Sing	7	obl:unmarked	_	SpaceAfter=No
14	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **give** | present · passive |  | It |  |  |  |  | vn give-13.1-1 «NP V NP»: subject=Theme |
| 2 | **turn** | present | the Earth | 15 degrees of longitude |  |  | hour |  | vn roll-51.3.1 «NP V NP.theme»: agent=Agent degree=Theme |

<!-- .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.

<!-- .note -->
*Sentence 2:* Determine the difference in longitude between two places whose local times differ by two hours.

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:2
# text = Determine the difference in longitude between two places whose local times differ by two hours.
1	Determine	determine	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	difference	difference	NOUN	NN	Number=Sing	1	obj	_	_
4	in	in	ADP	IN	_	5	case	_	_
5	longitude	longitude	NOUN	NN	Number=Sing	1	obl	_	_
6	between	between	ADP	IN	_	8	case	_	_
7	two	two	NUM	CD	NumForm=Word|NumType=Card	8	nummod	_	_
8	places	place	NOUN	NNS	Number=Plur	5	nmod	_	_
9	whose	whose	PRON	WP$	Poss=Yes|PronType=Rel	11	nmod:poss	_	_
10	local	local	ADJ	JJ	Degree=Pos	11	amod	_	_
11	times	time	NOUN	NNS	Number=Plur	12	nsubj	_	_
12	differ	differ	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	acl:relcl	_	_
13	by	by	ADP	IN	_	15	case	_	_
14	two	two	NUM	CD	NumForm=Word|NumType=Card	15	nummod	_	_
15	hours	hour	NOUN	NNS	Number=Plur	12	obl	_	SpaceAfter=No
16	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **determine** | imperative | you *not said here* | the difference |  | longitude between two places |  |  | vn discover-84 «NP V NP»: agent=Agent difference=Topic |
| 2 | **differ** | present | local times |  |  |  | hour |  | vn correspond-36.1 «NP V»: agent=Agent |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
Seven and a half degrees

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:o1:1
# text = Seven and a half degrees
1	Seven	seven	NUM	CD	NumForm=Word|NumType=Card	0	root	_	_
2	and	and	CCONJ	CC	_	5	cc	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	half	half	NOUN	NN	Number=Sing|NumForm=Word|NumType=Frac	5	compound	_	_
5	degrees	degree	NOUN	NNS	Number=Plur	1	conj	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Thirty degrees

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:o2:1
# text = Thirty degrees
1	Thirty	thirty	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	degrees	degree	NOUN	NNS	Number=Plur	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
Fifteen degrees

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:o3:1
# text = Fifteen degrees
1	Fifteen	fifteen	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	degrees	degree	NOUN	NNS	Number=Plur	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
Sixty degrees

```conllu
# sent_id = question:world:98-explorers-mapping-the-world:e4:o4:1
# text = Sixty degrees
1	Sixty	sixty	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	degrees	degree	NOUN	NNS	Number=Plur	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**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.

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- ← previous: [Explorers and how the world was mapped, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/world/98-explorers-mapping-the-world/e3/)
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