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Aim: Weathering and Erosion

Explore the processes of physical and chemical weathering, from frost wedging to acid rain effects on rocks. Learn about erosion by water, ice, wind, and gravity, and discover features like karst topography. Dive into movies, photos, and animations to enhance your understanding.

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Aim: Weathering and Erosion

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  1. Aim: Weathering and Erosion

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

  3. 1. 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 • Upward Expansion of Rock • Temperature changes

  4. Frost Wedging

  5. Frost Heaving

  6. Plant Roots

  7. Friction and Repeated Impact(Stream ABRASION)

  8. Burrowing of Animals

  9. Upward Expansion of Rock due to the releasing of pressure of overlying rock unloading off the surface. (notice the peeling of the rock) Ex. Granite (Exfoliation…peeling)

  10. Temperature Changes

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

  12. KEY IDEA: Water plus humid and warm environments • Water weathers rock by dissolving it

  13. Oxygen • Iron (Fe) combines with oxygen (O2) in the presence of water in a process called oxidation • The product of oxidation is rust

  14. Carbon Dioxide • CO2 dissolves in rain water and makes carbonic acid • Carbonic acid easily weathers Limestone and marble …key mineral is CALCITE

  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. • Made 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. A BIG KEY is Water Erosion • Rivers, streams, and runoff

  23. Ice Erosion • Glaciers-Ice moves and picks up rock

  24. Wind Erosion- mostly in dry climates

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

  26. SOME MOVIES (Brain Pop) PHOTOS http://glencoe.mcgraw-hill.com/sites/dl/free/0078600499/164213/00050754.html http://science.nationalgeographic.com/science/photos/weathering-erosion-gallery.html ANIMATION: http://ees.as.uky.edu/sites/default/files/elearning/module07swf.swf

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