23 3 water shapes the land

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23 3 water shapes the land

  1. 1. Water shapes the land 23-3
  2. 2. Sediment <ul><li>Dirt and dust from the earth washed away by water. </li></ul><ul><li>As water washes sediment away it is eventually deposited. </li></ul><ul><li>Deposition is the process in which sediment is laid down in new locations </li></ul>
  3. 3. The Miss. River deposits sediment from the continent into the Gulf of Mexico.
  4. 4. Water erosion <ul><li>Streams of water carries sediment suspended in it. </li></ul><ul><li>Saltation is when particles bounce along a stream bottom. </li></ul><ul><li>Faster a stream moves the more sediment it can carry – increasing abrasion. </li></ul><ul><li>A stream ability to erode depends on its speed </li></ul>
  5. 5. Water Erosion <ul><li>Water collects sediment and deposits it where the current slows – usually at the river’s mouth </li></ul><ul><li>Ex. – Mississippi Delta </li></ul>
  6. 6. This stream starts in the Rocky Mountains winds through this valley and ends in the Gulf of Mexico carrying sentiment as it goes.
  7. 7. Water over time will cut through rock and deposit it downstream As the Colorado River has here in the Grand Canyon
  8. 8. Groundwater Erosion <ul><li>Includes sinkholes and caves </li></ul><ul><li>Caves are carved into soft stone usually below the water table </li></ul><ul><li>Stalagmite – If the water and minerals drip to the floor a pillar forms </li></ul><ul><li>Sinkholes - erosion weakens limestone under the ground causing a weak spot. </li></ul>
  9. 9. This tunnel in The Cave of the Winds was created by ground water washing away the weaker stone. Eventually this area became dry and left a cave.
  10. 10. These are Stalactites they form when water mixes with minerals and drip from a cave ceiling
  11. 11. Glaciers form where snow falls but does not melt. Two Types Continental – thick sheet of ice Valley – found on mountains Glaciers scrap off sediment and reposition it as they melt.
  12. 12. Wind Erosion <ul><li>Wind scours surface like sandpaper and removes loose sediment </li></ul>
  13. 13. Garden of the Gods in Colorado

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