Weathered sandstone boulder

Weathered sandstone boulder

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Weathered sandstone boulder. This massive lump of sandstone was once attached to the rock outcrop behind it. The processes of weathering caused it to become detached. It has since been smoothed and rounded by wind and water. Gradually it has weathered further and has split into three pieces. Weathering can occur by chemical or mechanical processes. Chemical weathering involves removal of part of the rock in solution by chemical reactions, for example with rainwater. Mechanical weathering causes rock to disintegrate due to physical processes such as extremes of cold or hot temperatures, or freezing and thawing of water. Photographed in Arizona, USA.

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Keywords: america, arizona, boulder, eroded, erosion, geology, geomorphology, petrified forest national park, rock, rocks, rocky, sandstone, united states, us, weathered, weathering

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