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Weathering and Erosion

Weathering and Erosion. Weathering. The breakdown of the materials of Earth’s crust into smaller pieces. 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

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Weathering and Erosion

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  1. Weathering and Erosion

  2. Weathering • The breakdown of the materials of Earth’s crust into smaller pieces.

  3. 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

  4. Frost Wedging

  5. Frost Heaving

  6. Plant Roots

  7. Friction and Repeated Impact

  8. Burrowing of Animals

  9. Temperature Changes

  10. Chemical Weathering • The process that breaks down rock through chemical changes. • The agents of chemical weathering • Water • Oxygen • Carbon dioxide • Living organisms • Acid rain

  11. Water • Water weathers rock by dissolving it

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

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

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

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

  16. Karst Topography • 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.

  17. Features of Karst: Sinkholes

  18. Features of Karst: Caves

  19. Features of Karst: Disappearing Streams

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

  21. Water Erosion • Rivers, streams, and runoff

  22. Ice Erosion • Glaciers

  23. Wind Erosion

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

  25. 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.

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