          National Geographic Photo of the Day: Pinnacle Rock

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Photo of the Day   February 13, 2007    PREVIOUS [4]   |  NEXT [5]
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Bartolome Island, Ecuador, 1986 Photograph by Sam Abell Ripples of lava
frozen in time wrinkle the surface of Pinnacle Rock off the Galapagos'
Bartolome Island. The formation is the eroded remains of a volcanic
tower known as a tuff cone. Tuff cones are formed when magma from an
inland volcano reaches the sea, sputtering layer upon layer of basalt
ash that eventually rises into this monument of nature.

(Photograph shot on assignment for, but not published in, the National
Geographic book Majestic Island Worlds, 1986)    RELATED
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