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Question
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.
Answer
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