Mount Spurr is an ice and snow-covered stratovolcano complex, meaning that it is a large, cone-shaped volcano formed by lava flows, pyroclastic deposits, mudflow deposits, and lava domes.
YAMAGUCHI—An eruption of Mount Aso in Kumamoto Prefecture 90,000 years ago created a pyroclastic flow that traveled 170 kilometers north to the Sabagawa river here, the longest such distance ...
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