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Mount Saint Helens

A satellite composite showing Mount Saint Helens on June 26, 2021 and July 11, 2021.
A satellite composite showing Mount Saint Helens on June 26, 2021 and July 11, 2021. Gif: Brian Kahn/Sentinel Hub

Of the major peaks in the Cascades, Mount Saint Helens is one of the lower ones. The 1980 eruption caused the mountain to lose 1,300 feet (396 meters) in elevation. The eruption also destroyed most of the mountain’s glaciers, though a new one did form inside the crater at the summit. The mountain has considerably less snow than its taller, more heavily glaciated cousins. But the disappearance is still shocking to see.