Ash particle, 1980 Mount St. Helens eruption, magnified 200 times
By Volcano Hazards Program
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