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How much of Mount St. Helens was blown off during the 1980 eruption? A. 4,000 meters B. 400 meters C. 40 meters
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The 1980 eruption of Mount St. Helens was one of the most significant volcanic events in United States history. The eruption dramatically changed the mountain's height and shape through a massive lateral blast and subsequent collapse.

Final Answer

Helens during the 1980 eruption. The eruption removed approximately
401 meters401 \text{ meters}
from the mountain's height, which rounds to 400 meters, making option B the most accurate answer.

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