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Understanding Weathering and Erosion: Natural Processes in Earth's Landscape

Learn about physical and chemical weathering, erosion types, and their impacts on landforms. Explore how water, ice, wind, and other forces shape our environment.

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Understanding Weathering and Erosion: Natural Processes in Earth's Landscape

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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 process 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 • 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

  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

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