"Ash-darkened east slopes as they appeared on March 30. This ash was derived entirely from rock pulverized by the explosively-expanding, high-temperature steam and other gases. No new rock material was produced during the stage of the eruption. Note that the location of the ash fall indicates the direction of the prevailing wind. Mount Rainier, another volcanic peak, is visible in the background." (U.S. Dept. Of Commerce, 1980, p. 3)

Image of Mount St. Helens showing an  ash-darkened east slope on March 30, 1980.
Ash-darkened east slope on March 30, 1980
Photo: Courtesy of NGDC/NOAA.

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