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Gulfs are formed by movements in the Earth's crust. The Earth's tectonic plates break apart creating a gulf.

This is a gulf

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A u-shaped valley is formed when a glacier runs through a v-shaped valley and weathers the rock

This is a u-shaped valley

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Sand dunes are formed by wind moving and dropping off  sand forming a hill of sand.

This is a sand dune

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Caves are formed by limestone dissolving.

This is a cave

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A river breaks up rocks, and the sediment is carried down the river which makes the canyon deeper over time.

This is a canyon

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Waves carry rocks, gravel, and other things from the bottom of the ocean,  to a shoreline. Then, waves break up the rocks.

This is a beach

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When a river meets a lake or ocean, the water slows down and can't carry sediment. At the mouth of the river, the sediment is dropped off. Over time ome rivers drop enough sediment to where the waves and tides  can't carry it away. It builds up in layers and forms a delta. It is called a delta because it is shaped like a Greek symbol called a delta. It looks like a fan or triangle.

This is a delta