Swanage and Coastal Erosion
- Words:
- 2778
- Submitted:
- Sun Dec 15 2002

... Sketch Map of Swanage showing Coastal Features Coastal Erosion A coast is a long narrow zone where land and sea meet. The sea erodes the coast in four ways: * Hydraulic Action Lots of sea and water crashes against the land, and air and water are trapped and compressed in rock surface cracks. When the sea moves again the air expands explosivel weakening the rocks, enlarging the cracks and breaking pieces off. * Corrasion (abrasion) This is very effective and is caused by brocken rock fragments hitting the land, cliffs etc.. and breaking off other pieces of rocks. * Attrition This occurs when rock fragments grind against each other down into smaller and smoother pebbles and shingle and finally sand which is later deposited as beaches etc... * Corrosion This involves chemical action of sea on rock. If the rock is limestone, it dissolves in the sea water - some salts can also react with certain rocks and cause them to














