Earth science 6.2

770 views
553 views

Published on

Published in: Education, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
770
On SlideShare
0
From Embeds
0
Number of Embeds
14
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Earth science 6.2

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

×