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Crater Lake, part of North America’s Cascade Range is a product of volcanism.
This cinder-cone island rising on the Western side of the lake, the sheers 600 meter high cliffs that reamed the lake, and the surrounding deposits of lava and ash are all clues to the lake’s volcanic history.
Thousands of years ago, Mount Mazama, a 3,700-meter volcanic mountain covered the Crater Lake sight. Beneath the mountain was a large chamber of magma, a collection of gas and molten rock.
In a tremendously powerful eruption more than 6,000 years ago, cracks open the beneath of volcano and drain the way several cubic kilometers of molten material. The weight of the volcanic cone then collapse in the emptied chamber, leaving behind a great basin a caldera.
The Caldera later filled with water and the Crater Lake was created.
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