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A cave is a hole in the ground(sometimes above ground).It is formed when water weathers it for many years,erodes it away,and deposits it in someplace else.Water is used to form it.

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A rock arch is a rock formation with a gap underneath.Sometimes a rock arch forms above the water.The water weathers the rock,erodes it away,&drops it of in a new place.The rock arches that are above water always get weathered away.Water is mainly used to make it.

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A beach is an area of sand that is near the ocean.A beach is formed when waves weathers sediment, carries it away, & drops it off on the beach.Water is used to create it.

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A delta is a triangle shaped mini island that the mouth of a river meets with a delta.A delta is formed when a river gathers up sediment,washes it away,and drops it off in a new place.Water is used to make it .

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Glaciers are big masses of ice packed together.Glaciers are formed when masses of ice are packed with other masses to form the glacier.As a glacier moves along a valley(or in between something else)it weathers rock along the way.Then,it erodes them away,and drops off the rocks someplace else.Ice is used to make it.

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A sand dune is a hill or pile of sand.A new sand dune is created when wind weathers sand from another sand dune,erodes it away, and deposits it in a new place where another sand dune will form.Wind is used to form the dunes.