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Earth science 6.2
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Earth science 6.2

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  • 1. 6.2 The Work of Streams
  • 2. Bed Load• Sediment that is carried by a stream along the bottom of its channel
  • 3. capacity• The total amount of sediment a stream is able to transport
  • 4. alluvium• Sorted material deposited by a stream
  • 5. Delta• An accumulation of sediment formed where a stream enters a lake or an ocean
  • 6. Natural Levee• An elevated landform that parallels a stream and acts to confine its waters, expect during floodstage
  • 7. floodplain• The flat, low-lying portion of a stream valley subject to periodic flooding
  • 8. flood• Occurs when the discharge of a stream becomes so great that it exceeds the carrying capacity of its channel and overflows its banks
  • 9. Drainage basin• The land area that contributes water to a stream
  • 10. Divide• An imaginary line that separates the drainage of two streams; often found along a ridge
  • 11. Key Concept• Streams generally erode their channels lifting loose particles by abrasion, grinding, and by dissolving soluble materials.
  • 12. Key Concept• Deposition occurs as streamflow drops below the critical settling velocity of a certain particle size. The sediment in that category begins to settle out.
  • 13. Key Concept• A narrow V-shaped valley shows that the stream’s primary work has been down
  • 14. Key Concept• Most floods are caused by rapid spring snow melt or storms that bring heavy rains over a large region.
  • 15. Key Concept• Measures to control flooding include artificial levees, flood control dams, and placing limits on floodplain development.
  • 16. Key Concept• A drainage basin is the land area that contributes water to a stream