---
title: A clever puzzle: Krakatoa's bang was heard nearly 5,000 km away. Sou… — Famous eruptions and living with volca… · tree and pragmatics
description: A clever puzzle: Krakatoa's bang was heard nearly 5,000 km away. Sound travels about 1,200 km an hour. Roughly how long after the blast did the far listeners hear it? Test 9 · ★★ of lesson 47 «Famous eruptions and living with volcanoes» of the geography course of Mova's primary school, with the depe
---

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# Test 9 · ★★ · Famous eruptions and living with volcanoes

<!-- .ven lang=en -->
A clever puzzle: Krakatoa's bang was heard nearly 5,000 km away. Sound travels about 1,200 km an hour. Roughly how long after the blast did the far listeners hear it?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** Krakatoa, Sound, far listeners · **What happens:** hear, bang, travel, do · **To what, where:** clever puzzle, 1,200 km, blast

<!-- .vabout -->
This is test 9 · ★★ of lesson 47 «Famous eruptions and living with volcanoes» of the geography 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/geography/47-famous-eruptions-and-living-with-volcanoes/#t9).

## The question {#question}

<!-- .note -->
*Sentence 1:* A clever puzzle: Krakatoa's bang was heard nearly 5,000 km away.

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:1
# text = A clever puzzle: Krakatoa's bang was heard nearly 5,000 km away.
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	clever	clever	ADJ	JJ	Degree=Pos	3	amod	_	_
3	puzzle	puzzle	NOUN	NN	Number=Sing	9	nsubj	_	SpaceAfter=No
4	:	:	PUNCT	:	_	3	punct	_	_
5	Krakatoa	Krakatoa	PROPN	NNP	Number=Sing	7	nmod:poss	_	SpaceAfter=No
6	's	's	PART	POS	_	5	case	_	_
7	bang	bang	NOUN	NN	Number=Sing	3	conj	_	_
8	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	9	aux:pass	_	_
9	heard	hear	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
10	nearly	nearly	ADV	RB	_	11	advmod	_	_
11	5,000	5000	NUM	CD	NumForm=Digit|NumType=Card	12	nummod	_	_
12	km	km	NOUN	NNS	Number=Plur	13	obl:unmarked	_	_
13	away	away	ADV	RB	_	9	advmod	_	SpaceAfter=No
14	.	.	PUNCT	.	_	9	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hear** | past · passive |  | a clever puzzle and Krakatoa's bang |  |  |  | away *property* | vn see-30.1-1-1 «NP V S»: subject=Stimulus |
| 2 | **bang** |  | Krakatoa |  |  |  |  |  | nom bang «event transitive»: poss=agent |

<!-- .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:* Sound travels about 1,200 km an hour.

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:2
# text = Sound travels about 1,200 km an hour.
1	Sound	sound	NOUN	NN	Number=Sing	2	nsubj	_	_
2	travels	travel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	about	about	ADV	RB	_	4	advmod	_	_
4	1,200	1200	NUM	CD	NumForm=Digit|NumType=Card	5	nummod	_	_
5	km	km	NOUN	NN	Number=Sing	2	obl	_	_
6	an	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
7	hour	hour	NOUN	NN	Number=Sing	2	obl:unmarked	_	SpaceAfter=No
8	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **travel** | present | Sound | 1,200 km |  |  | hour |  | vn run-51.3.2-1 «NP V»: agent=Theme |

<!-- .note -->
*Sentence 3:* Roughly how long after the blast did the far listeners hear it?

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:3
# text = Roughly how long after the blast did the far listeners hear it?
1	Roughly	roughly	ADV	RB	_	3	advmod	_	_
2	how	how	ADV	WRB	PronType=Int	3	advmod	_	_
3	long	long	ADV	RB	Degree=Pos	7	advmod	_	_
4	after	after	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	blast	blast	NOUN	NN	Number=Sing	7	obl	_	_
7	did	do	VERB	VBD	Mood=Ind|Number=Sing|Person=1|Tense=Past|VerbForm=Fin	0	root	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
9	far	far	ADJ	JJ	Degree=Pos	10	amod	_	_
10	listeners	listener	NOUN	NNS	Number=Plur	11	nsubj	_	_
11	hear	hear	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	ccomp	_	_
12	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	11	obj	_	SpaceAfter=No
13	?	?	PUNCT	.	_	7	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **do** | past |  |  |  |  | after the blast | long *property* | tree rules |
| 2 | **hear** | present | the far listeners | blast |  |  |  |  | vn see-30.1-1-1 «NP V S»: agent=Experiencer it=Stimulus |

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
About 4 hours

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:o1:1
# text = About 4 hours
1	About	about	ADV	RB	_	2	advmod	_	_
2	4	4	NUM	CD	NumForm=Digit|NumType=Card	3	nummod	_	_
3	hours	hour	NOUN	NNS	Number=Plur	0	root	_	_
```

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

### Option 2 {#o2}

<!-- .ven lang=en -->
About 4 days

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:o2:1
# text = About 4 days
1	About	about	ADV	RB	_	2	advmod	_	_
2	4	4	NUM	CD	NumForm=Digit|NumType=Card	3	nummod	_	_
3	days	day	NOUN	NNS	Number=Plur	0	root	_	_
```

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

### Option 3 {#o3}

<!-- .ven lang=en -->
About 4 minutes

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:o3:1
# text = About 4 minutes
1	About	about	ADV	RB	_	2	advmod	_	_
2	4	4	NUM	CD	NumForm=Digit|NumType=Card	3	nummod	_	_
3	minutes	minute	NOUN	NNS	Number=Plur	0	root	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
About 4 seconds, at once

```conllu
# sent_id = question:geography:47-famous-eruptions-and-living-with-volcanoes:t9:o4:1
# text = About 4 seconds, at once
1	About	about	ADV	RB	_	2	advmod	_	_
2	4	4	NUM	CD	NumForm=Digit|NumType=Card	3	nummod	_	_
3	seconds	second	NOUN	NNS	Number=Plur	0	root	_	SpaceAfter=No
4	,	,	PUNCT	,	_	3	punct	_	_
5	at	at	ADP	IN	_	6	case	_	_
6	once	once	ADV	RB	NumForm=Word|NumType=Mult	3	nmod	_	_
```

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

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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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