COASTS (I)

Waves Please use this video to help answer the questions. Wave Terminology Define these key terms:(i) Swash(ii) Backwash Wave Characteristics Using the card sort, complete the tables below: Constructive Waves Smaller wave height Weak backwash carries away little sediment Strong swash moves sediment up the beach Gentle beach profile Low-energy waves Low frequency Destructive Waves Larger wave height Strong backwash carries away lots of sediment Weak swash moves little sediment up the beach Steep beach profile High-energy waves High frequency Look at the diagram below, about FETCH. Which wind (A, B or C) do you feel would produce the largest wave? Why?Which wind (A, B or C) do you feel would produce the smallest wave? Why? Match up the type of coastal erosion with its definition: Hydraulic power Air and water become trapped in the joints and cracks of the cliff. When the wave breaks, the trapped air compresses and weakens the rock causing erosion. Abrasion Bits of rock and sand in the waves and thrown onto the cliffs and beach and act like sandpaper to grind down the cliff surface. Attrition Rocks and pebbles are carried by the waves and hit against one another, breaking into smaller and smoother particles. Solution Acids (salts) within the sea water dissolve some types of rock (chalk easily eroding them. The distance between one crest to another crest or from one trough to another tough is called wave height wave breaker wavelength Wave Size and Energy depends on the following except _. wind energy fetch heavy rain The world's largest ocean is _. Atlantic Ocean Pacific Ocean Indian Ocean Constructive waves _ the coast. build up erode / destroy does not affect