ch14_2302 - IG4e_14_opener IG4e_14_opener Weathering and...

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Unformatted text preview: IG4e_14_opener IG4e_14_opener Weathering and Mass Wasting Physical Weathering Chemical Weathering and its Landforms Mass Wasting Induced Mass Wasting Processes and Landforms or Arctic and Alpine Tundra weathering is the combined action of physical weathering, in which rocks are fractured and broken, and chemical weathering, in which rock minerals are transformed to softer or more soluble forms Figure 14.1, p. 483 Weathering and Mass Wasting Physical Weathering physical weathering produces regolith from massive rock by the action of forces strong enough to fracture the rock (frost action, salt-crystal growth, unloading, and wedging by plant roots) in chemical weathering , the minerals that make up rocks are chemically altered or dissolved (the end products are often softer and bulkier forms that are more susceptible to erosion and mass movement) one of the most important physical weathering processes in cold climates is frost action , the repeated growth and melting of ice crystals in the pore spaces of soil and in rock fractures when water freezes in bedrock joints and bedding planes, it expands and can split rocks apart Physical Weathering Figure 14.2, p. 483 in arid climates, slow evaporation of ground water from outcropping sandstone surfaces causes the growth of salt crystals crystal growth breaks the rock apart grain by grain, producing niches, shallow caves, and rock arches Physical Weathering Figure 14.6, p. 486 A former habitation of Native Americans occupies a large niche in sandstone in the lower wall of - Canyon de Chelly, AZ Physical Weathering unloading occurs as...
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This note was uploaded on 06/04/2010 for the course GEOG 1F91 taught by Professor Nealpilger during the Fall '10 term at Brock University.

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ch14_2302 - IG4e_14_opener IG4e_14_opener Weathering and...

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