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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.