Photo credit: USGS
Mount St. Helens in Washington State shot a steam and ash plume at least 16,000 feet into the air Monday after a large rockfall from the lava dome in the volcano's crater.
The crater was formed by the volcano's deadly May 18, 1980 eruption that killed 57 people and blasted about 1,300 feet off the then-9,677-foot peak.
According to the U.S. Geological Survey, there was no explosion and events such as this one are expected during lava dome growth.
Those who like to keep their eyes open for activity can monitor the Mount St. Helens VolcanoCam.
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