Multiple Choice
What volcanic events formed Crater Lake,Oregon? When did they take place?
A) A powerful explosion blew away the top of a stratovolcano 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 pyroclastic-flow eruptions 6000 years ago.
Correct Answer:
Verified
Correct Answer:
Verified
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