Coasts 0.0 / 5 ? GeographyCoastal zonesGCSEEdexcel Created by: emmajane_Created on: 11-05-14 14:48 How are waves formed? By wind passing over the surface area of the sea. This creates friction, which causes a swell- which is the wave 1 of 16 What are the two types of waves? Constructive and destructive 2 of 16 What is swash? When the wave breaks oand is washed up onto the beach 3 of 16 What is backswash? WHen water runs back down the beach 4 of 16 What are the features of a constructive wave? The swash is stronger than the backswash 5 of 16 What are the features of a destructive wave? The backswash is stronger than the swash 6 of 16 Describe the form of a destructive wave and what it does. It has a short wavelength and is high and deep and it erodes 7 of 16 Describe the form of a constructive wave It has a long wavelength and is long and shallow 8 of 16 What do constructive waves do? They break on the shore and deposite material, building up beaches 9 of 16 Name 4 ways a destructive wave can break down a coastline 1. Hydraulic action 2. Abraision 3. Attrition 4. Solution 10 of 16 What is hydraulic action? Air's trapped in cracks of cliff. When wave breaks, air's compressed, weakening the cliff, resulting in erosion 11 of 16 What is abrasion? Bits of rock and sand gring down cliffs surface like sandpaper 12 of 16 What is attrition? Waves smash rocks and pebbles together on shore. They break and become smoother 13 of 16 What is solution? Acids contained in sea dissolves chalk and limestone cliffs 14 of 16 What is deposition? When the sea loses energy, it drops the sand, rock particles and pebbles it has been carrying. 15 of 16 When does deposition happen? When swash is stronger than abckswash- destructive wave 16 of 16
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