Weathering and Soils - WEATHERING AND SOILS Balanced Rock...

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WEATHERING AND SOILS Balanced Rock, Devil’s Playground, Petrified Forest National Park, Arizona
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Weathering decomposition and disintegration of rocks and minerals at the Earth's surface by mechanical and chemical processes Erosion removal of weathered rocks and minerals from the place where they formed by moving water, gravity, wind or glaciers
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Types of Weathering Mechanical (or physical) Physically breaking down rocks; results in size reduction of particles but no change of chemistry Chemical breakdown or decomposition of rocks by chemical reaction (water, gases or solutions) Biological Weathering Activity by Lichens
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Mechanical Weathering Frost Wedging - expansion of freezing water in rock fractures, widens cracks
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Mechanical Weathering Salt Cracking - similar to frost wedging; due to salty groundwater and/or ocean spray plus evaporation forming crystals, whose expansion during growth breaks rocks Salt Weathering of Granite on Mediterranean Coast, St. Tropez, France
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Mechanical Weathering Abrasion - wearing and grinding of rock against rock examples include rocks in stream beds, below glaciers, and rocks sand-blasted by the wind Glacial Striations Potholes, Cataract Falls State Park, Indiana
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Mechanical Weathering Root wedging - tree roots growing in cracks
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Mechanical Weathering Exfoliation - pressure release fracturing due to pressure release above igneous plutons; often form concentric fractured layers (Exfoliation Sheets) Exfoliation Sheets, Olmstead Point, Yosemite National Park, California Half dome, Yosemite National Park, California
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Enchanted Rock, near Fredericksburg, Texas Rock Pedestals, Enchanted Rock
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