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EAPS 100: What event triggered the main eruption of Mount St. Helens in May 1980?

a. Earthquake.
b. Volcanic gas emissions.
c. Glacial melting.
d. Lava flow.

User Adrianm
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1 Answer

6 votes
The main eruption of Mount St. Helens in May 1980 was triggered by an earthquake.
User Wonster
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