---
title: Identify the origin of the magnetic field of the Earth. — Compasses and the magnetic Earth · tree and pragmatics
description: Identify the origin of the magnetic field of the Earth. Exam question 1 of lesson 30 «Compasses and the magnetic Earth» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Exam question 1 · Compasses and the magnetic Earth

<!-- .ven lang=en -->
Identify the origin of the magnetic field of the Earth.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you · **What happens:** identify · **To what, where:** origin

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This is exam question 1 of lesson 30 «Compasses and the magnetic Earth» of the physics 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/physics/30-compasses-and-the-magnetic-earth/#e1).

## The question {#question}

```conllu
# sent_id = question:physics:30-compasses-and-the-magnetic-earth:e1:1
# text = Identify the origin of the magnetic field of the Earth.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	origin	origin	NOUN	NN	Number=Sing	1	obj	_	_
4	of	of	ADP	IN	_	7	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	magnetic	magnetic	ADJ	JJ	Degree=Pos	7	amod	_	_
7	field	field	NOUN	NN	Number=Sing	3	nmod	_	_
8	of	of	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	Earth	Earth	PROPN	NNP	Number=Sing	7	nmod	_	SpaceAfter=No
11	.	.	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 origin of the magnetic field of the Earth |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent origin=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.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
The gravitational attraction of the Moon

```conllu
# sent_id = question:physics:30-compasses-and-the-magnetic-earth:e1:o1:1
# text = The gravitational attraction of the Moon
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	gravitational	gravitational	ADJ	JJ	Degree=Pos	3	amod	_	_
3	attraction	attraction	NOUN	NN	Number=Sing	0	root	_	_
4	of	of	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	Moon	Moon	PROPN	NNP	Number=Sing	3	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **attract** |  |  | the Moon |  |  |  |  | nom attraction «phenomenon transitive»: of=patient |

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

<!-- .ven lang=en -->
The motion of molten iron within the outer core

```conllu
# sent_id = question:physics:30-compasses-and-the-magnetic-earth:e1:o2:1
# text = The motion of molten iron within the outer core
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	motion	motion	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	molten	molten	ADJ	JJ	Degree=Pos	5	amod	_	_
5	iron	iron	NOUN	NN	Number=Sing	2	nmod	_	_
6	within	within	ADP	IN	_	9	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	outer	outer	ADJ	JJ	Degree=Pos	9	amod	_	_
9	core	core	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **motion** |  | molten iron |  |  |  |  | within the outer core | nom motion «communication intransitive»: of=agent within=obl |

### Option 3 {#o3}

<!-- .ven lang=en -->
A permanent bar magnet situated at the North Pole

```conllu
# sent_id = question:physics:30-compasses-and-the-magnetic-earth:e1:o3:1
# text = A permanent bar magnet situated at the North Pole
1	A	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
2	permanent	permanent	ADJ	JJ	Degree=Pos	4	amod	_	_
3	bar	bar	NOUN	NN	Number=Sing	4	compound	_	_
4	magnet	magnet	NOUN	NN	Number=Sing	0	root	_	_
5	situated	situate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	acl	_	_
6	at	at	ADP	IN	_	9	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	North	North	PROPN	NNP	Number=Sing	9	compound	_	_
9	Pole	Pole	PROPN	NNP	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **situate** | participle |  | a permanent bar magnet *not said here* |  | the North Pole |  |  | vn put-9.1 «NP V NP PP.destination»: agent=Agent at pole=Destination |

### Option 4 {#o4}

<!-- .ven lang=en -->
The accumulation of ice at the polar regions

```conllu
# sent_id = question:physics:30-compasses-and-the-magnetic-earth:e1:o4:1
# text = The accumulation of ice at the polar regions
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	accumulation	accumulation	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	4	case	_	_
4	ice	ice	NOUN	NN	Number=Sing	2	nmod	_	_
5	at	at	ADP	IN	_	8	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
7	polar	polar	ADJ	JJ	Degree=Pos	8	amod	_	_
8	regions	region	NOUN	NNS	Number=Plur	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **accumulate** |  |  | ice |  | the polar regions |  |  | nom accumulation «process transitive»: of=patient at=place |

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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: [Compasses and the magnetic Earth, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/physics/30-compasses-and-the-magnetic-earth/t11/)
- next →: [Compasses and the magnetic Earth, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/physics/30-compasses-and-the-magnetic-earth/e2/)
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