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What are KeySearch and the West Key Number System?
Pyroclastic Flows
Fast-moving currents of hot gas and volcanic materials (such as ash) that flow down the sides of a volcano during an explosive eruption.
Eruption Column
A towering cloud of ash, gas, and volcanic debris that rises above a volcano during an explosive eruption.
Caldera
A large, bowl-shaped volcanic depression, formed by the collapse of land following a volcanic eruption or the emptying of a magma chamber.
Basin-shaped Depression
A rounded or oval valley or hollow in the Earth's surface, typically formed by erosion or the collapse of a volcanic crater.
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