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Ash particle, 1980 Mount St. Helens eruption, magnified 200 times

1905 (approx.)

Detailed Description

Scanning electron micrograph (SEM) of a highly vesicular glass shard of ash measuring just over 0.1 mm long, erupted during the 18 May 1980 eruption of Mount St. Helens.

Sources/Usage

Public Domain.


USGS

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