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a geological formation constisting of an underground enclosure with access from the surface of the ground or from the
sea. a cave is formed when water erodes a crack in land then erodes the rocks away which then gets larger and larger to form a hole/cave into the ground.it is formed with the help of water.

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a v shaped valley is a long depression in the surface of the land is a v shape and usually contains a river. the valley is formed when a river or running water erodes flat land then makes a crack in the earth it also erodes the rocks away so that it looks like the picture below.it is formed with the help of water.

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a canyon is a steep sided valley, a canyon is formed when rocks weather down a valley then erodes it into the river. it is formed with the help of running water.

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a piece of land of sand sloping down  to an ocean, lake, or sea. a beach is made when rocks weather down to sand then erode to were the beach will be which then deposites to form a beach with the help of water.

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a glacier is a slowly moving mass of ice. most glaciers are found in the north and south pole and mountain ranges. glaciers are made when snow doesn't melt away and begins to pile up and freeze. ice helps the glaciers creation. glaciers are made of water rocks and sediment. glaciers use weathering erosion and deposition because when the glacier is moving in a valley down a mointain or so on it scrapes rocks moves them and deposites them at the end.

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sand dunes are ridges of sand that is created by wind.which is usually found in desserts or near lakes and oceans. a sand dune uses weathering to break the rocks into sand then erosion because it blows it to where the sand dune is going to be then last but not least deposition because the sand piles up into a hill.wind is the cause of this formation.