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Exogenous Landforming Processes

Exogenous Landforming Processes. Weathering and Erosion. Weathering and Erosion. Weathering. The breakdown do the materials of Earth’s crust into smaller pieces. Physical Weathering. Process by which rocks are broken down into smaller pieces by external conditions.

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Exogenous Landforming Processes

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  1. Exogenous Landforming Processes Weathering and Erosion

  2. Weathering and Erosion

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

  4. 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

  5. Frost Wedging

  6. Frost Heaving

  7. Plant Roots

  8. Friction and Repeated Impact

  9. Burrowing of Animals

  10. Temperature Changes

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

  12. Water • Water weathers rock by dissolving it

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

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

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

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

  17. 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

  18. Features of Karst: Sinkholes

  19. Features of Karst: Caves

  20. Features of Karst: Disappearing Streams

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

  22. Water Erosion • Rivers, streams, and runoff

  23. Ice Erosion • Glaciers

  24. Wind Erosion

  25. Mass Movements • Landslides, mudslides, slump and creep

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