P.G.ADAM,PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY P.G.ADAM,PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Petrified wood. Sections of fossilized trees side by side. Petrification is the process by which organic material is converted to have a mineral composition. It occurs where plant material has been covered by sediments very rapidly. Photographed in the Petrified Forest National Park, Arizona, USA.
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