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Understanding Weathering and Erosion: Processes that Shape Earth's Crust

This presentation explores the essential geological processes of weathering and erosion that break down and move Earth's materials. Weathering, categorized into physical and chemical types, explains how rocks are disintegrated and altered. Physical weathering includes mechanisms such as frost wedging and plant root growth, while chemical weathering involves agents like water, oxygen, and acid rain. Erosion further transports debris through water, ice, wind, and gravity, illustrated by phenomena such as sinkholes and landslides.

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Understanding Weathering and Erosion: Processes that Shape Earth's Crust

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Presentation Transcript

  1. Weathering and Erosion

  2. Weathering • The breakdown do 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. Sinkholes

  17. Caves

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

  19. Water Erosion • Rivers, streams, and runoff

  20. Ice Erosion • Glaciers

  21. Wind Erosion

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

  23. www.augusta.k12.va.us/66877372584019/lib/66877372584019/_files/Weathering_and_Erosion.ppt · PPT file

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