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Geology notes september 29 for exam 2

Geology notes september 29 for exam 2 - -B horizon Heavily...

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Geology 9/29/08 Physical and chemical weathering convert rocks into soil then sediment -rock cycle Physical weathering breaks up rocks -Frost wedging is an important type of physical weathering 1. Liquid water enters cracks 2. Water expands when it freezes to ice so it pushes rock apart 3. Ice thaws and rock fragments fall away Physical weathering affects the shape of rocks -Exfoliation of granite caused by expansion and contraction due to temperature cycles -Ventifacts are produced by sand blasting deserts *Physical weather breaks rocks down Chemical weathering dissolves rocks -The minerals are attacked by carbonic acid -Mineral stability follows an inverted Bowen’s reaction series -MEMORIZE Bowen’s reaction series Carbonic acid is produced by the decay or organic matter in soils Soil is organized into three main horizons -A horizon: Intensely leached organic rich
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Unformatted text preview: -B horizon: Heavily leached-C horizon: Moderately leached or weakly leached Physical and chemical weathering together produce.-Sand: rock fragments and resistant minerals like quartz-Clay: microscopic sheet silicate minerals-Dissolved salts: mostly sodium bicarbonate Weathering products are carried to the ocean by the hydrologic cycle-The hydrologic cycle is driven by solar energy-Material is transported both in solution and in suspension by water flowing to the ocean Erosion and transport of sediments is controlled by stream velocity-Sediment transport occurs mostly during floods Each river gathers up materials from its drainage basin and carries them to the ocean-Drainage basins are separated by drainage divides Blacksburg is on the drainage divide between the Roanoke River and the New River...
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