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Chapter 7 Erosion

Chapter 7 Erosion. What is Erosion and Deposition?. Erosion – A process that moves the sediments from one location to another, usually by gravity, glaciers, wind, or water . Deposition – Final step in an erosional process, sediments are dropped as their energy of motion decreases. .

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Chapter 7 Erosion

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  1. Chapter 7 Erosion

  2. What is Erosion and Deposition? • Erosion – A process that moves the sediments from one location to another, usually by gravity, glaciers, wind, or water. • Deposition – Final step in an erosional process, sediments are dropped as their energy of motion decreases.

  3. Erosion by Gravity • Mass Movement – when gravity alone causes loose material to move downslope. • Slump – one large mass of loose material moves downhill leaving a curved scar. • Creep – sediments move downhill slowly, causing posts and trees to lean.

  4. Glaciers • Glaciers are a mass of snow and ice that move slowly downhill due to its weight.

  5. Glacial Erosion • Plucking – rock fragments are loosened, broken off, and carried away by the freezing of water in rock cracks.

  6. Wind Erosion • Deflation – removes loose, fine-grained sediments (silt & clay), and leaves behind coarser material. • Abrasion – wearing/scraping away by sand grains or other particles striking other sand grains and rocks, breaking off small fragments.

  7. Other types of wind erosion • Sand Storm • Dust Storm

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