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WAVE EROSION How do waves form? • By wind that blows across the water’s surface. • The wind causes water particles to move up and down as a wave goes by. The water particles themselves don’t move forward. • Think of it as wind blowing tall grass in the field. The grass moves back and forth but doesn’t move from its place. Erosion by Wave • Waves erode the land by impact and abrasion. • Large waves hit the rocks along the shore causing them t to break apart. • In shallow water, it picks up sediments and then when the wave hits the land it causes the sediments to wear away rock like sandpaper. Landforms created by Wave Erosion • Many features can be formed from waves as they hit up against a rocky coast. • It starts wearing away and form many different types of features • Examples: – Sea caves – Cliffs – Sea stacks – Sea Arches – Pillars Deposits by Waves • Waves shape the coast through both erosion and deposition. • Deposition occurs when waves slow down and the water drops its sediments. • Features formed from wave deposition – Beaches – Longshore drift – Spit Deposition Formations • A beach is an area of wave washed sediments along a coast. • A longshore drift the sediments moves down the beach with the current. • A spit is a beach that projects like a finger out into the water.