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Standing petrified (silicified) trees on Specimen Ridge in northeastern Yellowstone National Park.

By Yellowstone Volcano Observatory
Two standing petrified (silicified) trees on Specimen Ridge in northeastern Yellowstone National Park
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Two standing petrified (silicified) trees on Specimen Ridge in northeastern Yellowstone National Park. Photo by Jacob W. Frank, Yellowstone National Park (https://www.flickr.com/photos/yellowstonenps/50016729252).

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Public Domain.

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The hot and cold journey of silica begins in Yellowstone’s rhyolite and ends in geyser cones, petrified trees, and algae

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