---
title: After a big volcano erupts, sunsets around the world look extra red.… — Mirrors, rainbows and the blue sky · tree and pragmatics
description: After a big volcano erupts, sunsets around the world look extra red. Why? Test 3 · ★ of lesson 21 «Mirrors, rainbows and the blue sky» 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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# Test 3 · ★ · Mirrors, rainbows and the blue sky

<!-- .ven lang=en -->
After a big volcano erupts, sunsets around the world look extra red. Why?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 3 · wrong ✗ · **Who acts:** big volcano · **What happens:** erupt, sunset, look · **To what, where:** world

<!-- .vabout -->
This is test 3 · ★ of lesson 21 «Mirrors, rainbows and the blue sky» of the physics course of Mova's primary school. 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/21-mirrors-rainbows-and-the-blue-sky/#t3).

## The question {#question}

<!-- .note -->
*Sentence 1:* After a big volcano erupts, sunsets around the world look extra red.

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:1
# text = After a big volcano erupts, sunsets around the world look extra red.
1	After	after	SCONJ	IN	_	5	mark	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
3	big	big	ADJ	JJ	Degree=Pos	4	amod	_	_
4	volcano	volcano	NOUN	NN	Number=Sing	5	nsubj	_	_
5	erupts	erupt	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	advcl	_	SpaceAfter=No
6	,	,	PUNCT	,	_	5	punct	_	_
7	sunsets	sunset	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
8	around	around	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	world	world	NOUN	NN	Number=Sing	7	obl	_	_
11	look	look	VERB	VB	VerbForm=Inf	7	xcomp	_	_
12	extra	extra	ADJ	JJ	Degree=Pos	13	amod	_	_
13	red	red	ADJ	JJ	Degree=Pos	11	xcomp	_	SpaceAfter=No
14	.	.	PUNCT	.	_	7	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **erupt** | present | a big volcano |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |
| 2 | **sunset** | present |  |  |  | the world |  |  | tree rules |
| 3 | **look** | infinitive |  |  |  |  |  | red *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |

<!-- .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:* Why?

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:2
# text = Why?
1	Why	why	ADV	WRB	PronType=Int	0	root	_	SpaceAfter=No
2	?	?	PUNCT	.	_	1	punct	_	_
```

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

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The volcano heats up the Sun

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:o1:1
# text = The volcano heats up the Sun
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	volcano	volcano	NOUN	NN	Number=Sing	3	nsubj	_	_
3	heats	heat	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	up	up	ADP	RP	_	3	compound:prt	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	Sun	Sun	PROPN	NNP	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **heat up** | present | the volcano | the Sun |  |  |  |  | vn cooking-45.3 «NP V NP.patient»: agent=Agent sun=Patient |

### Option 2 · ← Mova's choice {#o2}

<!-- .ven lang=en -->
Glowing light from the hot lava reflects all over the sky

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:o2:1
# text = Glowing light from the hot lava reflects all over the sky
1	Glowing	glow	VERB	VBG	VerbForm=Ger	7	csubj	_	_
2	light	light	NOUN	NN	Number=Sing	1	obj	_	_
3	from	from	ADP	IN	_	6	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	hot	hot	ADJ	JJ	Degree=Pos	6	amod	_	_
6	lava	lava	NOUN	NN	Number=Sing	1	obl	_	_
7	reflects	reflect	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
8	all	all	ADV	RB	_	11	advmod	_	_
9	over	over	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	sky	sky	NOUN	NN	Number=Sing	7	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **glow** | gerund |  | light |  | the hot lava |  |  | vn light\_emission-43.1 «NP V NP.theme»: agent=Agent light=Theme |
| 2 | **reflect** | present | Glowing | the sky |  |  |  |  | tree rules |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
Dust in the air scatters away even more of the blue

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:o3:1
# text = Dust in the air scatters away even more of the blue
1	Dust	dust	NOUN	NN	Number=Sing	5	nsubj	_	_
2	in	in	ADP	IN	_	4	case	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	air	air	NOUN	NN	Number=Sing	1	nmod	_	_
5	scatters	scatter	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	away	away	ADV	RB	_	5	advmod	_	_
7	even	even	ADV	RB	_	8	advmod	_	_
8	more	more	ADJ	JJR	Degree=Cmp	5	obj	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	blue	blue	ADJ	JJ	Degree=Pos	8	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **scatter away** | present | Dust in the air | more |  |  |  | away *property* | vn spray-9.7-1 «NP V NP.theme»: agent=Agent more=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The volcano paints the clouds red

```conllu
# sent_id = question:physics:21-mirrors-rainbows-and-the-blue-sky:t3:o4:1
# text = The volcano paints the clouds red
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	volcano	volcano	NOUN	NN	Number=Sing	3	nsubj	_	_
3	paints	paint	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	clouds	cloud	NOUN	NNS	Number=Plur	3	obj	_	_
6	red	red	ADJ	JJ	Degree=Pos	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **paint** | present | the volcano | the clouds |  |  |  | red *property* | vn image\_impression-25.1 «NP V NP.destination»: agent=Agent cloud=Destination |

<!-- div src -->

**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.

<!-- /div -->

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