'Scoria, Klamath Falls, Oregon'

'Scoria, Klamath Falls, Oregon'

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: 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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Keywords: arem collection, basalt, basaltic magma, bubbles, carbonation, cooling history, gas bubbles, geologic feature, geological, geology, grain size, grains, igneous, magma, mineralogy, obsidian, properties, rock, rocks, scoria, specimen, texture, volcanic activity, volcanic glass, volcanoes

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