---
title: Ascertain the origin of the Earth's magnetic field. — The Earth as a planet · tree and pragmatics
description: Ascertain the origin of the Earth's magnetic field. Exam question 2 of lesson 5 «The Earth as a planet» of the space 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 2 · The Earth as a planet

<!-- .ven lang=en -->
Ascertain the origin of the Earth's magnetic field.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** you · **What happens:** ascertain · **To what, where:** origin

<!-- .vabout -->
This is exam question 2 of lesson 5 «The Earth as a planet» of the space 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/space/5-the-earth-as-a-planet/#e2).

## The question {#question}

```conllu
# sent_id = question:space:5-the-earth-as-a-planet:e2:1
# text = Ascertain the origin of the Earth's magnetic field.
1	Ascertain	ascertain	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	_	9	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	Earth	Earth	PROPN	NNP	Number=Sing	9	nmod:poss	_	SpaceAfter=No
7	's	's	PART	POS	_	6	case	_	_
8	magnetic	magnetic	ADJ	JJ	Degree=Pos	9	amod	_	_
9	field	field	NOUN	NN	Number=Sing	3	nmod	_	SpaceAfter=No
10	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the origin of the Earth's magnetic field |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent origin=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 · ← Mova's choice {#o1}

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

```conllu
# sent_id = question:space:5-the-earth-as-a-planet:e2:o1:1
# text = The gravitational influence of the Moon
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	gravitational	gravitational	ADJ	JJ	Degree=Pos	3	amod	_	_
3	influence	influence	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	_	_
```

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

### Option 2 {#o2}

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

```conllu
# sent_id = question:space:5-the-earth-as-a-planet:e2:o2:1
# text = A permanent magnet situated at the geographic North Pole
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	permanent	permanent	ADJ	JJ	Degree=Pos	3	amod	_	_
3	magnet	magnet	NOUN	NN	Number=Sing	0	root	_	_
4	situated	situate	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl	_	_
5	at	at	ADP	IN	_	9	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
7	geographic	geographic	ADJ	JJ	Degree=Pos	9	amod	_	_
8	North	North	PROPN	NNP	Number=Sing	9	compound	_	_
9	Pole	Pole	PROPN	NNP	Number=Sing	4	obl	_	_
```

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

### Option 3 {#o3}

<!-- .ven lang=en -->
Electrical discharges within the atmosphere

```conllu
# sent_id = question:space:5-the-earth-as-a-planet:e2:o3:1
# text = Electrical discharges within the atmosphere
1	Electrical	electrical	ADJ	JJ	Degree=Pos	2	amod	_	_
2	discharges	discharge	NOUN	NNS	Number=Plur	0	root	_	_
3	within	within	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	atmosphere	atmosphere	NOUN	NN	Number=Sing	2	nmod	_	_
```

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

### Option 4 · ✓ the right answer {#o4}

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

```conllu
# sent_id = question:space:5-the-earth-as-a-planet:e2:o4:1
# text = The motion of liquid 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	liquid	liquid	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** |  | liquid iron |  |  |  |  | within the outer core | nom motion «communication intransitive»: of=agent within=obl |

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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: [The Earth as a planet, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/space/5-the-earth-as-a-planet/e1/)
- next →: [The Earth as a planet, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/space/5-the-earth-as-a-planet/e3/)
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