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Download Weathering Weathering The breaking down of rocks and other
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Weathering Weathering The breaking down of rocks and other materials on the Earth’s surface Mechanical Weathering Size and shape of rock is changed Chemical make-up of rock remains the same Temperature Expansion and Contractions causes rock to break Frost Action Freeze/thaw cycles break down rock as water enters cracks and widens them Organic Activity Root Pry occurs as roots help break down rock Abrasion Particles carried by wind, water create smooth surfaces Gravity Causes rocks to collide as they fall or roll down slopes. Collisions break rocks down. Chemical Weathering Water Can dissolve rock Can form acids as they react with rocks and atmosphere Oxidation Oxygen combines with elements in the rock Often rocks become discolored Carbonation Carbon dioxide with water creates carbonic acid that eats away rock: Caves Sulfuric Acid Active in areas with where coal is burned Stronger than carbonic acid Plant Acid Lichens and moss roots secrete acids to break down rocks to form soil Rate of Weathering Depends of Factors Composition Stability Climate Time exposed Amount of area exposed
