During, Pyroclastic Flows
The area most heavily affected by
the 1980 eruptions was the valley floor directly in front of the crater.
Hot mixtures of volcanic gas, pumice, and ash are known as pyroclastic
flows. During the May 18th eruption, pyroclastic flows swept down the
north flank of the volcano. They burned and buried everything in their
path.
These pyroclastic flows moved very
fast and were very hot. In their path, no plants or animals survived.
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Plants and Animals, During
Plants and Animals
Mount St. Helens
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The area most heavily affected by
the 1980 eruptions was the valley floor directly in front of the crater.
Hot mixtures of volcanic gas, pumice, and ash are known as pyroclastic
flows. During the May 18th eruption, pyroclastic flows swept down the
north flank of the volcano. They burned and buried everything in their
path.