Myung J. Chun / Los Angeles Times
In an ashen-colored landscape, climbing ranger Gretchen Schwinn pauses near U.S. Geological Survey equipment during a descent of 8,365-foot Mt. St. Helens. In 1980, when an earthquake rattled Mt. St. Helens, 1,300 feet of the summit collapsed and an explosion of trapped gas killed wildlife and toppled trees over 200 square miles.
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