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WATER EROSION

EROSION AND DEPOSITION. WATER EROSION. Runoff and Erosion. Precipitation over the United States averages about 75 cm per year. About 22.5 cm becomes runoff. Generally, more runoff means more erosion. . Runoff and Erosion.

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WATER EROSION

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  1. EROSION AND DEPOSITION WATER EROSION

  2. Runoff and Erosion • Precipitation over the United States averages about 75 cm per year. About 22.5 cm becomes runoff. Generally, more runoff means more erosion.

  3. Runoff and Erosion • Water flowing across the land runs together to form rills, gullies, and streams.

  4. Erosion by Rivers • A waterfall forms where a flat layer of tough rock lies over a layer of softer rock that erodes easily. When the softer rock erodes, pieces of the harder rock above break off, creating the waterfall’s sharp drop.

  5. Erosion by Rivers • Erosion often forms meanders and oxbow lakes where a river winds across its floodplain.

  6. Deposits by Rivers • Deposition creates landforms such as alluvial fans and deltas.

  7. Alluvial Fan

  8. The Course of a River • The slope and size of a river, as well as the sediment it carries, determine how a river shapes the land.

  9. Groundwater Erosion • Karst topography is found in many parts of the United States where the bedrock is made up of thick layers of limestone.

  10. Groundwater Erosion • Chemical weathering of limestone and groundwater erosion can create a limestone cave.

  11. Previewing Visuals • Before you read, preview Figure 10. Then write two questions you have about the illustration in a graphic organizer like the one below. As you read, answer your questions. The Course of a River Q. What features does a river produce by erosion? A. V-shaped valley, bluffs Q. What feature does a river produce by deposition? A. Delta

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