6._Weathering_and_soil_White

6._Weathering_and_soil_White - Weathering and Soil...

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Weathering and Soil Sandstone Weathering at Bryce Canyon National Park, Utah
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Weathering, Soil & Transportation Rocks exposed at Earth’s surface are constantly changed by water, air, temperature variations and other factors Cleopatra’s Needle, 1450 BCE Weathering of Granite in
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Effects of weathering Chemical Weathering: Slate Vs. Marble Headstones Marble Statue
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Effects of Weathering Spheroidal weathering
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Effects of Weathering: Differential Weathering Softer rocks (shales) erode more rapidly than harder rocks (sandstones)
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Weathering, Soil & Transportation Weathering is the group of destructive processes that change physical and chemical character of rocks at or near Earth’s surface About.com & Physicalgeography.net
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Weathering and Earth Systems Atmosphere Hydrosphere Biosphere
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Weathering and Earth Systems Atmosphere Oxygen and carbon dioxide critical to chemical weathering Water cycled through atmosphere is critical to chemical and mechanical weathering processes Chemical weathering also removes carbon dioxide from the atmosphere, helping keep
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Weathering and Earth Systems Hydrosphere Water is necessary for chemical weathering Oxygen dissolved in water oxidizes iron in rocks Carbon dioxide dissolved in water creates carbonic acid Primary cause of chemical weathering Running water loosens and abrades particles Glacial ice removes and abrades particles Niagara Falls, USA and Horseshoe Falls, Canada
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Weathering and Earth Systems Biosphere Plant root growth widens cracks Animal movement and human activity mechanically weather Decaying o rganic matter in soils produces acidic soil moisture Weathering by Lichens
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Types of Weathering Mechanical weathering Physical disintegration Frost action, pressure-release fracturing, plant growth, burrowing animals, salt wedging, thermal cycling Chemical weathering Decomposition of rock from exposure to atmospheric gases (oxygen, water vapor and carbon dioxide) New chemical compounds (minerals) form Rate increased by increased rock surface area
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This note was uploaded on 03/06/2012 for the course GEO 505 taught by Professor Johnschmidt during the Spring '12 term at CUNY Graduate School of Journalism.

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6._Weathering_and_soil_White - Weathering and Soil...

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