Multiple Choice
What volcanic events formed Crater Lake, OR? When did they take place?
A) A powerful explosion blew away the top of a composite volcano; 10 million years ago.
B) The crater of a large, extinct cinder cone filled with water; 5 million years ago.
C) Landslides and volcanic mudflows dammed the Mazama River; 500 years ago.
D) Caldera collapse followed major ash and pyrodastic-flow eruptions; 7700 years ago.
Correct Answer:
Verified
Correct Answer:
Verified
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