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Unformatted text preview: up to 9% of magma may be gas Magma release magma rises via a conduit to the surface. Craters a bowl shaped depression atop a volcano. Craters are up to 500 m across; 200 m deep. Caldera a gigantic volcanic depr4ession Form from massive eruptions...
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This note was uploaded on 10/12/2010 for the course GLG 72595 taught by Professor Burt during the Fall '10 term at University of Arizona- Tucson.
- Fall '10