Landforms of emergence and submergence

• Formation of a Fjord and an example (submergence)

  - This is a drowned glacial valley. As sea levels rise, U-shaped valleys left by glaciers are submerged

  - Have steep valley sides & fairly straight & narrow valleys on either side

  - At the mouth they have a shallower section called a threshold- this is thought ti be due to reduced glacial erosion as the glacier came into contact with the sea

  
  

  e.g Loch Torridon, West coast of Scotland

  
• Formation of a Ria and an example (submergence)

  - This is a drowned river valley.

  - As sea levels rise they flood the river valleys, leaving only the highland visible

  - Ria's have a long section and cross profile typical of a river valley

  
  

  e.g commonly found in Pembrokeshire, Devon and Cornwall

  
• Formation of a dalmatian coastline and example (submergence)

  - Type of coastline occurs when valleys running parallel to coast become flooded as a result of sea level change

  - This leaves a series of narrow, long and rugged islands

  
  

  e.g Adriatic coast, Croatia

  
• What does submergence usually mean

  flooded- links to eustatic change
• formation of a raised beach and an example (emergence)

  - Areas of former wave-cut platforms and their beaches which are at a higher level than the present sea level

  - Beaches of sand, shingle and shell deposits which stand well above the present sea-level

  - The sediments often rest on old wave-cut platforms

  - Created by uplift of land or fall in sea level

  - repeated uplifts of land or drops in sea-level produce a series of raised beaches

  
  

  e.g Isle of Arran

  
• Formation of marine platform (emergence)

  - flat or gently sloping area of rock found along coastlines, partially exposed at low tide

  - These platforms are formed by erosional processes and are result of interaction between sea and rock along shore

  
• What does emergence usually mean

  Raised- linked to isostatic rebound/ recovery