The depression in which Crater Lake is now located is the result of the top of Mt. Mazama being blown off in a cataclysmic eruption.

Name: The depression in which Crater Lake is now located is the result of the top of Mt. Mazama being blown off in a cataclysmic eruption.
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The depression in which Crater Lake is located was formed by the collapse of the volcano Mount Mazama after a massive eruption approximately 7,700 years ago, not by a gradual erosion process.

The Depression in Which Crater Lake Is Now Located Is