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- Yellowstone Caldera is considered a supervolcano because within the past two million years it has erupted extremely violently three times .
Question 1:
Yellowstone Caldera is considered a supervolcano because within the past two million years it has erupted extremely violently three times . The most recent eruption occurred this long ago, and spread volcanic ash over most of the North American continent.
A. 1,510,000 years
B. 40,000 years
C. 640,000 years
D. 17,000 years
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