Coast - The narrow strip where the sea, land and air meet each other., Marine Erosion - Waves break rock at the coast, transporting it away., Hydraulic action - Waves push air into small cracks in cliffs. This expands the cracks until loose pieces of rock break away., Abrasion - Rocks transported by waves crash against cliffs, breaking pieces of rock away from them., Solution - Weak acids in sea water dissolve rock, wearing cliffs away., Attrition - Rocks transported by waves crash into each other and break, eventually becoming small, smooth round pebbles., Weathering - Wildlife and weather break rock at the coast, but it stays in the same place., Chemical weathering - Rock is worn down by weak acids in rain water., Physical weathering - Water in small cracks in cliffs repeatedly freezes and thaws. This expands the cracks until loose pieces of rock break away., Biological weathering - Rock is broken by burrowing animals and the growing roots of plants.,

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