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Wind and Wave Erosion

Wind and Wave Erosion. How is wind abrasive?. It carries sand grains that grind and scour anything that they hit. What is Loess and how does it form?. It can be 1m to 100m deep. Made of mineral & rock particles.

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Wind and Wave Erosion

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  1. Wind and Wave Erosion

  2. How is wind abrasive? • It carries sand grains that grind and scour anything that they hit

  3. What is Loess and how does it form? • It can be 1m to 100m deep. • Made of mineral & rock particles. • It is wind-carried sediment & when dropped, it will hold together so well that when it erodes, it splits off vertically to form cliff-like slopes

  4. What is a sand dune? Draw a picture and label the windward and leeward sides • Sand dunes - hills of sand deposited by wind. They form when the sand piles up against shrubs, boulders, or other substances

  5. How does a sand dune migrate? • When wind blows against the windward side (side facing into the wind) of a dune, some of the surface sand is carried over top & falls on the leeward side (side facing against the wind)

  6. Draw a wave and label its parts (Crest, Trough, Height)

  7. How do swash and backwash work together? • Swash - the motion of water up the beach. • Backwash – the motion of water running back down the beach

  8. What is a longshore current? How does it affect someone swimming at the beach? • It runs parallel to shore. It moves people down the beach.

  9. What is a rip current? Why is it dangerous? • Strong surface currents that flow away from the beach. They can reach up to 5 km/hr. & carry you away from shore.

  10. Describe the process of a sea cliff turning into a sea stack. (4 parts) • 1. Sea cliff - waves cut out rock & make a notch

  11. 2. Sea cave - notch will deepen & make a hole

  12. 3. Sea arch – waves cut through walls of sea caves to make an arch

  13. 4. Sea stacks – roof of sea arch falls into water

  14. What is a sandbar? • A bar of sand formed by ocean currents depositing sand near the shore underwater

  15. What is a hook? • A spit with a curved end

  16. What is a barrier island? • Sandbars not attached to land or the shoreline and are above water

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