Weathering and Erosion

Information about Weathering and Erosion

Published on January 10, 2008

Author: Vincenza

Source: authorstream.com

Content

Weathering and Erosion:  Weathering and Erosion Weathering:  Weathering The breakdown do the materials of Earth’s crust into smaller pieces. Physical Weathering:  Physical Weathering Process by which rocks are broken down into smaller pieces by external conditions. Types of Physical weathering Frost heaving and Frost wedging Plant roots Friction and impact Burrowing of animals Temperature changes Frost Wedging:  Frost Wedging Frost Heaving:  Frost Heaving Plant Roots:  Plant Roots Friction and Repeated Impact:  Friction and Repeated Impact Burrowing of Animals:  Burrowing of Animals Temperature Changes:  Temperature Changes Chemical Weathering:  Chemical Weathering The process that breaks down rock through chemical changes. The agents of chemical weathering Water Oxygen Carbon dioxide Living organisms Acid rain Water:  Water Water weathers rock by dissolving it Oxygen:  Oxygen Iron combines with oxygen in the presence of water in a processes called oxidation The product of oxidation is rust Carbon Dioxide:  Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid Carbonic acid easily weathers limestone and marble Living Organisms:  Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock Acid Rain:  Acid Rain Compounds from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering Karst Topography:  Karst Topography A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams. Created by chemical weathering of limestone Features of Karst: Sinkholes:  Features of Karst: Sinkholes Features of Karst: Caves:  Features of Karst: Caves Features of Karst: Disappearing Streams:  Features of Karst: Disappearing Streams Erosion:  Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil. Water Erosion:  Water Erosion Rivers, streams, and runoff Ice Erosion:  Ice Erosion Glaciers Wind Erosion:  Wind Erosion Mass Movements:  Mass Movements Landslides, mudslides, slump and creep landslide clip.mpeg

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