1. Quelle est la cause directe d’une éruption volcanique ?
2. Quel énoncé décrit le mieux un risque volcanique ?
3. Quelle caractéristique permet de reconnaître une éruption effusive ?
Risque volcanique — cause ?
Arrivée de magma en surface
Type d’éruption effusive
Coulées de lave fluide
Type d’éruption explosive
Violentes explosions, nuées ardentes
Prévision fiable
Détection de signes annonciateurs
Prévention volcanique
Aménagement, plans d’évacuation, bulletins
Séisme — définition ?
Secousses violentes du sol
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