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Earth Science Bellringer

Earth Science Bellringer. Get out your “Renewable & Nonrenewable Resources Lab” Turn it in to the Basket. Everyday is a Holiday!. National Goof –off day!. II. Weathering & Erosion 8min. 1. Weathering 2. Erosion. Is the break-up of rock due to exposure to the atmosphere.

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Earth Science Bellringer

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  1. Earth Science Bellringer • Get out your “Renewable & Nonrenewable Resources Lab” • Turn it in to the Basket

  2. Everyday is a Holiday! • National Goof –off day!

  3. II. Weathering & Erosion 8min

  4. 1. Weathering 2. Erosion Is the break-up of rock due to exposure to the atmosphere. is the removal and transport of earth materials by natural agents A. Weathering and Erosion

  5. 1. Mechanical 2. Chemical Takes place when rock splits and breaks into smaller pieces of the same material with out changing its composition. Takes place when the rocks minerals are changed into different substances http://www.history.com/shows/how-the-earth-was-made/videos/erosion B. Two types of Weathering

  6. -When water seeps into cracks of rocks then freezes (water volume expands 10% when frozen) C. Mechanical Weathering Examples 1. Ice wedging

  7. 2. Wetting & Drying 3. Small Plants 4. Small Animals 5. Sheet Jointing 6. Exfoliation -Repeated wetting and drying of rock is very effective at breaking up rocks that contain clay. -Roots grow down into 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.

  8. Reaction of H2O & other substances Reaction of oxygen & other substances - Dissolves minerals to create undergound caverns. D. Chemical Weathering Examples 1. Hydrolysis 2. Oxidation 3. Carbonic acid

  9. Feldspar +Water = Clay Feldspar A Clay Cliff

  10. Review (12min)

  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. 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. Weathering & Erosion Review In your comp book … Complete the following “Weathering & Erosion” review -Pg. 244 #1-5 Analyzing Data (red text) - Pg. 245 #1-3 Section Assessment

  21. Get a text book … turn to page 238-244. • Video: Weathering and Erosion. • Alka Seltzer packets next class.

  22. Sink Holes

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