---
title: Mars looks red because its dust contains iron oxide, the same kind o… — Rust: iron's slow fire · tree and pragmatics
description: Mars looks red because its dust contains iron oxide, the same kind of substance as rust. Who acts: Mars, dust. A sentence of the lesson «Rust: iron's slow fire» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Rust: iron's slow fire, sentence 21

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Mars looks red because its dust contains iron oxide, the same kind of substance as rust.

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**Who acts:** Mars, dust · **What happens:** look, contain · **To what, where:** iron oxide

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This is a sentence of the lesson «Rust: iron's slow fire» of the chemistry 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 (Mars, dust), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:013-rust-irons-slow-fire.lesson:21
# text = Mars looks red because its dust contains iron oxide, the same kind of substance as rust.
# source = school lesson (ours)
# course = chemistry
# lesson = 013-rust-irons-slow-fire.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): no change
1	Mars	Mars	PROPN	NNP	Number=Sing	2	nsubj	_	_
2	looks	look	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	red	red	ADJ	JJ	Degree=Pos	2	xcomp	_	_
4	because	because	SCONJ	IN	_	7	mark	_	_
5	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	dust	dust	NOUN	NN	Number=Sing	7	nsubj	_	_
7	contains	contain	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	advcl	_	_
8	iron	iron	NOUN	NN	Number=Sing	9	compound	_	_
9	oxide	oxide	NOUN	NN	Number=Sing	7	obj	_	_
10	,	,	PUNCT	,	_	13	punct	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	13	det	_	_
12	same	same	ADJ	JJ	Degree=Pos	13	amod	_	_
13	kind	kind	NOUN	NN	Number=Sing	9	appos	_	_
14	of	of	ADP	IN	_	15	case	_	_
15	substance	substance	NOUN	NN	Number=Sing	13	nmod	_	_
16	as	as	ADP	IN	_	17	case	_	_
17	rust	rust	NOUN	NN	Number=Sing	13	nmod	_	_
18	.	.	PUNCT	.	_	2	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **look** | present | Mars |  |  |  |  | red *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |
| 2 | **contain** | present | ore's dust | iron oxide |  |  |  |  | vn comprise-107.2-2 «NP V NP»: agent=Pivot oxide=Theme |

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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:chemistry:013-rust-irons-slow-fire.lesson:21`.

**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): no change. **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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- ← previous: [Rust: iron's slow fire, 20](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/13-rust-irons-slow-fire/20/)
- next →: [Tarnish and how metals change, 0](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/14-tarnish-and-how-metals-change/0/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/13-rust-irons-slow-fire/)