---
title: The Earth's inner core is a solid ball of iron and nickel about as h… — Magnets, compasses and big Earth facts · tree and pragmatics
description: The Earth's inner core is a solid ball of iron and nickel about as hot as the Sun's surface; the outer core is liquid metal. Who acts: inner core, outer core. A sentence of the lesson «Magnets, compasses and big Earth facts» of the myths course of Mova's primary school with its dependency tree and t
---

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# Magnets, compasses and big Earth facts, sentence 11

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The Earth's inner core is a solid ball of iron and nickel about as hot as the Sun's surface; the outer core is liquid metal.

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**Who acts:** inner core, outer core · **What happens:** be · **To what, where:** solid ball, liquid metal

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This is a sentence of the lesson «Magnets, compasses and big Earth facts» of the myths course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (inner core, outer core), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:myths:017-magnets-compasses-and-big-earth-facts.lesson:11
# text = The Earth's inner core is a solid ball of iron and nickel about as hot as the Sun's surface; the outer core is liquid metal.
# source = school lesson (ours)
# course = myths
# lesson = 017-magnets-compasses-and-big-earth-facts.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1, R7-rel-agree ×1
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	Earth	Earth	PROPN	NNP	Number=Sing	5	nmod:poss	_	_
3	's	's	PART	POS	_	2	case	_	_
4	inner	inner	ADJ	JJ	Degree=Pos	5	amod	_	_
5	core	core	NOUN	NN	Number=Sing	9	nsubj	_	_
6	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	cop	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
8	solid	solid	ADJ	JJ	Degree=Pos	9	amod	_	_
9	ball	ball	NOUN	NN	Number=Sing	0	root	_	_
10	of	of	ADP	IN	_	11	case	_	_
11	iron	iron	NOUN	NN	Number=Sing	9	nmod	_	_
12	and	and	CCONJ	CC	_	13	cc	_	_
13	nickel	nickel	NOUN	NN	Number=Sing	11	conj	_	_
14	about	about	ADV	RB	_	15	advmod	_	_
15	as	as	ADV	RB	_	16	advmod	_	_
16	hot	hot	ADJ	JJ	Degree=Pos	9	amod	_	Agree=R5-strong|Haiku=13:nmod
17	as	as	ADP	IN	_	21	case	_	_
18	the	the	DET	DT	Definite=Def|PronType=Art	19	det	_	_
19	Sun	Sun	PROPN	NNP	Number=Sing	21	nmod:poss	_	_
20	's	's	PART	POS	_	19	case	_	_
21	surface	surface	NOUN	NN	Number=Sing	16	obl	_	_
22	;	;	PUNCT	,	_	28	punct	_	_
23	the	the	DET	DT	Definite=Def|PronType=Art	25	det	_	_
24	outer	outer	ADJ	JJ	Degree=Pos	25	amod	_	_
25	core	core	NOUN	NN	Number=Sing	28	nsubj	_	_
26	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	28	cop	_	_
27	liquid	liquid	ADJ	JJ	Degree=Pos	28	amod	_	_
28	metal	metal	NOUN	NN	Number=Sing	9	parataxis	_	Agree=R7-rel-agree|Haiku=9:conj
29	.	.	PUNCT	.	_	9	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | the Earth's inner core | a solid ball |  |  |  | of iron and nickel | tree rules |
| 2 | **is a** | present | the outer core | liquid metal |  |  |  |  | tree rules |

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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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:myths:017-magnets-compasses-and-big-earth-facts.lesson:11`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×1, R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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