What volcanic events formed Crater Lake, Oregon? When did they take place?
A) Caldera collapse followed major ash and pyroclastic- flow eruptions; 6000 years ago.
B) A powerful explosion blew away the top of a stratovolcano; 10 million years ago.
C) The crater of a large, extinct cinder cone filled with water; 5 million years ago.
D) Landslides and volcanic mudflows dammed the Mazama River; 500 years ago.
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