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Photo of the Day

November 28, 2001

Mount Baker Geochemist, Washington, 1997

Photograph by James C. Richardson

"Taking his work to extremes, USGS [United States Geological Survey] geochemist Robert Symonds collects magma-heated steam in icy Sherman Crater. Mostly water from rain and snow, the steam also holds gases such as carbon dioxide. A change in the mix of components often signals a shift in volcanic activity."

—From "Cascadia: Living on Fire," May 1998, National Geographic magazine