Weathering Erosion and Deposition

Weathering Erosion and Deposition PowerPoint PPT Presentation


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Weathering Erosion and Deposition

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1. Weathering, Erosion, and Deposition

2. Weathering Weathering is the breakdown of rock at the Earth’s surface. Some of these changes happen quickly and some happen slowly. There are 2 Types: Mechanical and Chemical

3. Mechanical Weathering Mechanical Weathering – the type of weathering where rock is broken down into smaller pieces without changing the chemical properties of the rock. This can be caused by freezing and thawing, release of pressure, growth of plants, and actions of animals (including humans).

4. Example: Water seeps into a crack in a rock When the water freezes, it expands The force of the water expanding causes the rock to crack more. This is called ice wedging Freezing and Thawing

5. Plant Growth Roots of trees and other plants enter into cracks of rocks. As the plants get bigger, so do the roots. The growing roots force the cracks further apart.

6. Abrasion Abrasion is the grinding away of rock by other rock particles. These particles scrape away at other rocks like sandpaper on wood as they rub or roll against the surface.

7. Chemical Weathering Chemical weathering is the processes of breaking down rock through chemical changes. 5 things that cause chemical weathering: water, oxygen, carbon dioxide, living organisms (like lichens) and acid rain. Chemical weathering occurs more rapidly in warm wet climates.

8. Chemical Weathering causes the rock to experience a chemical change (changes its makeup) Water dissolves rocks over time Oxygen causes oxidation (rusting) Acid rain reacts with marble and limestone Living organisms – plant roots produce weak acids to dissolve rock around the roots, Chemical Change

10. CHECK- UP What type of weathering does each example cause? The roots of a plant An animal scratching Oxygen Water freezing Acid rain Wind Water A. Chemical Weathering B. Mechanical Weathering C. Both types of weathering

20. Erosion When sediments are moved from one place to another by natural forces, this is called Erosion. The agents of Erosion are Wind Water Waves Gravity Glaciers

21. Sediment The material moved by erosion is sediment. Sediment is small, solid particles of rocks or organisms.

22. Deposition When the sediment being carried is dropped (or deposited) in a new area, it is called deposition. Depositions can create new landforms like beaches and sand dunes.

23. CHECK-UP Choose one of the following for each example: 1.) Erosion 2.)Deposition a. A river carrying sand b. Dropping sediment in a new location c. A glacier picking up a rock in it’s path. d. A beach is formed. e. How a sand dune is created f. How sediment is moved g. Sand being carried by the wind in a sandstorm.

36. WHO DONE IT? THE DELICATE ARCH VICTIM: The Delicate Arch SUSPECT(S): Wind EVIDENCE: Rounded edges from ABRASION. 4. CREW: Erosion

37. WHO DONE IT? LANDSLIDE

38. WHO DONE IT? BEACHES GETTING SMALLER

39. WHO DONE IT? SEA CLIFFS

40. WHO DONE IT? SANDSTORMS

41. WHO DONE IT? DELTAS FORMING AT THE END OF RIVERS

42. WHO DONE IT? THE GRAND CANYON

43. WHO DONE IT? GLACIAL GROOVES IN BEDROCK

44. WHO DONE IT? SEA STACKS

45. WHO DONE IT? BEACHES GETTING BIGGER

46. WHO DONE IT? MUDSLIDES

47. WHO DONE IT? ROCKY BEACHES TURNING TO SAND

48. WHO DONE IT? SAND DUNES

49. WHO DONE IT? ROCKSLIDES

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