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Understanding Weathering and Erosion: Processes and Effects

Discover the mechanisms of weathering and erosion, including mechanical and chemical processes, and understand the impacts of natural agents on Earth's surface. Learn about ice wedging, root action, karst topography, and more. Explore how water, oxygen, carbon dioxide, and living organisms contribute to chemical weathering. Take detailed notes and diagrams for better comprehension.

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Understanding Weathering and Erosion: Processes and Effects

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  1. Weathering Erosion Is the break-up of rock due to exposure to the atmosphere. Why do rocks weather? Due to the differences between conditions below and conditions above ground. is the removal and transport of earth materials by natural agents Weathering and Erosion http://www.youtube.com/watch?v=CLFfmeirwjg

  2. Mechanical Chemical Processes of.. Takes place when rock splits and breaks into smaller pieces of the same material with out changing its composition. Takes place when the rock’s minerals are changed into different substances Water and water vapor are important. Ex. Formation of clay from the mineral feldspar. Mech-Frost action, wetting and drying, animals and plants, loss of overlying rock. Two types of Weathering

  3. Ice wedging When water seeps into cracks of rocks then freezes (water volume expands 10% when frozen)

  4. Wetting & Drying Small Plants Small Animals Sheet Jointing Exfoliation Repeated wetting and drying of rock is very effective at breaking up rocks that contain clay. Roots grow down int0 tiny cracks expanding and chipping the rock apart. Earth worms, ants and rodents dig holes in the soil exposing the under ground to air and water. When large masses of rock are lifted to form mountains and the surface rock removed… this reduces the pressure on the rock under-ground so the rock begins to expand. When large sheets of loosened rock break away from a rock outcrop.

  5. Sheet Jointing and exfoliation.

  6. Chemical Weathering Read BLk text pg134-136 Red text pg 242-245 Take notes add diagrams. Assignment topic question 1-6 pg #137

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

  8. Water • Water weathers rock by dissolving it

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

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

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

  12. 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

  13. Features of Karst: Sinkholes

  14. Features of Karst: Caves

  15. Features of Karst: Disappearing Streams

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