Wikipedia:Picture of the day/April 12, 2006

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Picture of the day

Pu'u O'o volcanic cone

Pu'u 'O'o is a classic cinder-and-spatter volcanic cone on Kilauea, Hawaii. Expanding gases in the lava fountain tears the liquid rock into irregular globs that fall back to earth, forming a heap around the vent. The still partly liquid rock splashing down and over the sides of the developing mound is called spatter.

Photo credit: G.E. Ulrich of the United States Geological Survey
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