          National Geographic Photo of the Day: Minerva Terrace

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Photo of the Day   April 10, 2007    PREVIOUS [4]   |  NEXT [5]
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Yellowstone National Park, Wyoming, 1984 Photograph by James L. Amos A
shimmering travertine deposit forms a limestone terrace around a
mineral spring at Mammoth Hot Springs in Yellowstone National Park.

This formation, called Minerva Terrace, formed as mineral-laden water
bubbled over and evaporated, leaving a sparkling white
calcium-carbonate crust. These deposits, which can accumulate at up to
a foot (30 centimeters) per year, create a spectacular and constantly
changing landscape.

(Photo shot on assignment for, but not published in, "The Planets:
Between Fire and Ice," January 1985, National Geographic magazine)
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