Sea-Level Change

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Sea-Level Change

  • During the Ice Age large amounts of water were stored as ice and snow, causing the sea levels to fall.

  • This exposed areas to erosion.
  • After the Ice Age, when the ice and snow melted, many coastal areas were flooded.
  • These rises and falls in sea level have created landforms such as drowned coasts and raised beaches.

Raised Beaches:

  • Caused by pre-glacial erosion of a coastline.
  • During the Ice Age the sea levels fall leaving the old coastline high above the present sea level.
  • Since the end of the Ice Age sea levels have risen again, but not to their previous levels.
  • The raised beaches continue to be above the present sea level by quite a distance.

Drowned Coasts

  • Sea Level rise after the last Ice Age caused estuaries and inlets to be flooded.
  • This occurred in South West England, drowning many river valleys around the coasts of Devon and Cornwall, and creating Rias.
  • In other, more northern areas, glacial valleys were drowned to create Fjords.

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