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Question: What volcanic events formed Crater Lake, OR? When did they take place?

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  1.  A powerful explosion blew away the top of a stratovolcano; 10 million years ago.
  2.  The crater of a large, extinct cinder cone filled with water; 5 million years ago.
  3.  Landslides and volcanic mudflows dammed the Mazama River; 500 years ago.
  4.  Caldera collapse followed major ash and pyroclastic-flow eruptions; 6000 years ago.

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4. Caldera collapse followed major ash and pyroclastic-flow eruptions; 6000 years ago.

Volcanic events formed Crater Lake was Caldera collapse followed major ash and pyroclastic-flow eruptions. It take place 6000 years ago.

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