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Weathering and Erosion
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Weathering: break-up of rox from exposure to atmosphere
• A)mechanical: break into smaller pieces w/o changing composition–frost action–plant growth–abrasion (rubbing)
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Frost Action
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Plant Growth
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B) Chemical weathering: rock changes into a different substance
• Hydrolysis: rock reacts w/water–mica clay
• Oxidation:reacts w/oxygen–-rust
• carbonation: reacts w/carbon dioxide–dissolves carbonate rocks (limestone)
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Oxidation
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Carbonation
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Carbonation: Acid Rain
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Karst Topography
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Karst Topography• Occurs in limestone bedrock
• limestone easily weathers chemically (carbonation) by weak acids in groundwater
• landforms created:–caverns–sinkholes–disappearing rivers
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Cavern
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Stalactites
Stalagmites
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Sinkholes
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Weathering is a slow process
• Fastest when
–warm, wet climate
–big temperature changes
–steep slopes
–little vegetation
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Erosion: movement of weathered material• Gravity
• ice
• water
• wind
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Gravity: Landslide
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Gravity: Talus
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Water Erosion
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Water Erosion
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Wind Erosion
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Deposition: