---
title: The deadliest danger is a pyroclastic flow, an avalanche of hot gas,… — Volcanoes: how and where · tree and pragmatics
description: The deadliest danger is a pyroclastic flow, an avalanche of hot gas, ash and rock racing downhill at over 100 km/h. Who acts: deadliest danger, hot gas. A sentence of the lesson «Volcanoes: how and where» of the geography course of Mova's primary school with its dependency tree and the pragmatics of
---

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# Volcanoes: how and where, sentence 12

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The deadliest danger is a pyroclastic flow, an avalanche of hot gas, ash and rock racing downhill at over 100 km/h.

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**Who acts:** deadliest danger, hot gas · **What happens:** be, race, avalanche · **To what, where:** pyroclastic flow, 100 km/h

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This is a sentence of the lesson «Volcanoes: how and where» of the geography 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 (deadliest danger, hot gas), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:geography:046-volcanoes-how-and-where.lesson:12
# text = The deadliest danger is a pyroclastic flow, an avalanche of hot gas, ash and rock racing downhill at over 100 km/h.
# source = school lesson (ours)
# course = geography
# lesson = 046-volcanoes-how-and-where.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
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	deadliest	deadly	ADJ	JJS	Degree=Sup	3	amod	_	_
3	danger	danger	NOUN	NN	Number=Sing	7	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	pyroclastic	pyroclastic	ADJ	JJ	Degree=Pos	7	amod	_	_
7	flow	flow	NOUN	NN	Number=Sing	0	root	_	_
8	,	,	PUNCT	,	_	10	punct	_	_
9	an	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
10	avalanche	avalanche	NOUN	NN	Number=Sing	7	appos	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	hot	hot	ADJ	JJ	Degree=Pos	13	amod	_	_
13	gas	gas	NOUN	NN	Number=Sing	10	nmod	_	_
14	,	,	PUNCT	,	_	15	punct	_	_
15	ash	ash	NOUN	NN	Number=Sing	13	conj	_	Agree=R5-strong|Haiku=10:conj
16	and	and	CCONJ	CC	_	15	cc	_	_
17	rock	rock	NOUN	NN	Number=Sing	18	compound	_	_
18	racing	race	VERB	VBG	Tense=Pres|VerbForm=Part	15	conj	_	_
19	downhill	downhill	ADV	RB	_	18	advmod	_	_
20	at	at	ADP	IN	_	23	case	_	_
21	over	over	ADV	RB	_	22	advmod	_	_
22	100	100	NUM	CD	NumForm=Digit|NumType=Card	23	nummod	_	_
23	km/h	km/h	NOUN	NN	Number=Sing	18	obl	_	_
24	.	.	PUNCT	.	_	7	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 | **is a** | present | the deadliest danger | a pyroclastic flow |  |  |  |  | tree rules |
| 2 | **race** | gerund | the deadliest danger *not said here* |  |  | 100 km/h |  | downhill *property* | vn run-51.3.2-2 «NP V PP.location»: agent=Theme at km/h=Trajectory |
| 3 | **avalanche** |  | hot gas and ash |  |  |  |  |  | nom avalanche «event intransitive»: of=agent |

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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:geography:046-volcanoes-how-and-where.lesson:12`.

**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. **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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