alb3846225

Scoria, Klamath Falls, Oregon

Volcanic activity causes magma (molten rock) to be violently ejected at the earth's surface. If magma cools slowly, as in a lava flow, a dense rock known as basalt may be the result; if cooling is extremely rapid, a volcanic glass such as obsidian may result. Gas bubbles trapped in magma are released in the same way as the carbonation in soft drinks when a container is opened. An extreme example of this is scoria, a dark rock created by the rapid cooling of basaltic magma that is filled with expanding gas bubbles.

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Titre: Scoria, Klamath Falls, Oregon

Légende: Voir la traduction automatique
Volcanic activity causes magma (molten rock) to be violently ejected at the earth's surface. If magma cools slowly, as in a lava flow, a dense rock known as basalt may be the result; if cooling is extremely rapid, a volcanic glass such as obsidian may result. Gas bubbles trapped in magma are released in the same way as the carbonation in soft drinks when a container is opened. An extreme example of this is scoria, a dark rock created by the rapid cooling of basaltic magma that is filled with expanding gas bubbles.

Crédit: Album / Science Source / JOEL AREM

Autorisations: ? Autorisation de modèle: Non - ? Autorisation de propriété: Non
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Taille de l'image: 3800 × 2550 px | 27.7 MB

Taille d'impression: 32.2 × 21.6 cm | 1496.1 × 1003.9 in (300 dpi)

Mots clés: BASALTE • GAZ • GEOLOGIE • OBSIDIENNE • PIERRE DURE OBSIDIENNE • REPORTAGE