Mt. Mazama Pumice

Mt. Mazama Pumice

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Credit: John R. Foster/SCIENCE PHOTO LIBRARY

Caption: Pumice collected near Crater Lake National Park in central Oregon. This pumice is from the eruption and caldera collapse of 12,000 ft, Mt. Mazama 7,600 years ago which led to the formation of Crater Lake. This form of volcanic rock is a result of powerfully explosive eruptions as indicated by the very porous structure that trapped volcanic gases. Pumice is so low density it easily floats on water.

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Keywords: caldera, calderas, cascade range, cascade volcano, cascade volcanos, cascades, crater lake, erupt, geologic, geology, lava, lava flow, lava flows, lava rock, mt. mazama, mt. mazama eruption, national park, nature, pumice, pyroclastic, pyroclastics, volcanic, volcanic rock, volcano, volcanology

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