Weathering and Erosion

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Weathering and Erosion

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Presentation transcript:

Weathering and Erosion

Weathering The breakdown of Earth’s crust into smaller pieces.

Mechanical (Physical) Weathering Process by which rocks are broken down into smaller pieces by external conditions. Types of Mechanical weathering Frost heaving and Frost wedging Plant roots Impact of wind and water Abrasion Burrowing of animals Temperature changes

Frost Wedging

Frost Heaving

Plant Roots

Friction and Repeated Impact

Burrowing of Animals

Temperature Changes

Chemical Weathering The process that breaks down rock through chemical changes. The agents of chemical weathering Water Oxygen Living organisms Acid Rain Carbon Dioxide

Water Water weathers rock by dissolving it

Oxygen Iron combines with oxygen in the presence of water in a processes called oxidation The product of oxidation is rust

Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock

Acid Rain Compounds from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering

Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid Carbonic acid easily weathers limestone and marble

Karst Topography Karst is created by chemical weathering of limestone A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams.

Features of Karst: Sinkholes

Features of Karst: Caves

Features of Karst: Disappearing Streams

Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil.

Water Erosion Rivers, streams, and runoff

Ice Erosion Glaciers

Wind Erosion

Mass Movements Landslides, mudslides, slump and creep landslide clip.mpeg

What have you learned? What is erosion? 2. How are weathering and erosion connected? Give 2 examples of weathering. 3. 4. Give 2 examples of erosion. 5. 6.