SIA3126: SEM image: Mount St. Helens Volcanic Ash

Photographer:USGS SEM image provided by A.M. Sarna-Wojcicki
Copyright:Public Domain
Date Added:2 December 2008
Location:Mount St. Helens, Wahsington

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Close view of a single ash particle from the eruption of Mount St. Helens; image is from a scanning electron microscope (SEM). The tiny voids or "holes" are called vesicles and were created by expanding gas bubbles during the eruption of magma.

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