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The sound of summer: rockfall inside the crater of Mount St. Helens.

Detailed Description

In summer, the crater of Mount St. Helens is filled with a near constant sound of rockfall from the steep 600 m high (about 2000 feet) crater walls. The falling rock kicks up ash and dust (pulverized rock) as it tumbles onto the crater floor. View of east crater wall.

Sources/Usage

Public Domain.

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