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Thirty-five years after Mount St. Helens erupted, satellites in orbit and scientists on ground still monitor the recovery.

This visualization of Mount St. Helens and its surrounding terrain was created from data acquired by NASA satellites.

This photo of Mount St. Helens was taken on May 17, 1980, one day before the eruption.

This photo of Mount St. Helens was taken on May 19, 1980, one day after the eruption.

This model shows the volcano’s summit before the blast (top) and after (bottom). The summit's elevation dropped from 9,678 feet to 8,366 feet.