features of submergence

• what is a ria?

  a permanently flooded lower course and estuary of a river
• the effect of a rise in sea level is to flood the coast, creating a submergent coastline
• Low lying featurs eg deltas, spits, beaches DISAPPEAR beneath the waves
• where are rias common?

  south west england
• give an example of a ria?

  the fal estuary in cornwall
• give the 3 features of submergence?

  rias, fjords, dalmation coast
• whare are Fjords?

  spectacular drowned glacial valleys
• describe fjords?

  • very deep
  • dramatic, sheer rock walls form their sides
  • waterfalls may plunge into the fjord from hanging valleys
• what do fjords consist of?

  a glacial rock basin with a shallower section at the end called the THRESHOLD
• what is the threshold of a fjord thought to have formed due to?

  reduced erosion when the glacier came into contact with the sea
• give an example of a fjord>?

  oban in western scotland

  can also be found in norway
• what is a dalmation coastr?

  where valleys and ridges of higher land run parallel to the coast
• what happens to a dalmation coast when the sea level rises?

  the valleys will flood , leaving just the highest points of the ridge exposed

  • thus we have a series of offshore islands , ruunning parallel to tthe coastline
• where can a dalmation coast be found?


  croatia