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Shoreline Erosion

Waves and Wind Shape the Shoreline. Shoreline Erosion. Waves. Waves pound the rocks and shells creating sand. The sand on a beach will consist of particles eroded from the surrounding area. Hawaii's black sand beaches come from the volcanic rock nearby.

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Shoreline Erosion

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  1. Waves and Wind Shape the Shoreline Shoreline Erosion

  2. Waves • Waves pound the rocks and shells creating sand. • The sand on a beach will consist of particles eroded from the surrounding area. • Hawaii's black sand beaches come from the volcanic rock nearby. • White sand beaches come from shells and coral.

  3. Longshore Drift • The longshore current ( runs parallel to shore) creates the longshore drift. • Longshore drift moves large amounts of sand along beaches. • Groins are installed to keep sand from drifting.

  4. Longshore Drift • cat

  5. Sand Trapped By Groins • cat

  6. Longshore Current Landforms • Longshore current also transport sand to form sandbars and spits • Spit – is a sand bar that has built up above the waters surface with one end joined to land. • Bay mouth bar- a spit that complete blocks a bay and creates a lagoon • Tombolo – is an island that join to land by a thin strip of sand.

  7. Spit • This spit is almost a bay mouth bar

  8. Tombolo • cat

  9. Barrier Island • Barrier island are formed by erosion and deposition

  10. Headland • Headland – an area of coastline that protrudes further into the sea than the surrounding coast.

  11. Sea Arch • Sea arches form when softer stone is eroded behind the headland.

  12. Sea stack • Stacks form when the roof of a sea arch collapses.

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