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a cavity in the ground, especially in limestone bedrock, caused by water erosion and providing a route for surface water to disappear underground.

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an area of low-lying, uncultivated ground where water collects; a bog or marsh.

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A waterfall is a place where water flows over a vertical drop or a series of drops in the course of a stream or river. Waterfalls also occur where melt water drops over the edge of a tabular iceberg or ice shelf.

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a small body of still water formed naturally or by hollowing or embanking.

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an area of low-lying land that is flooded in wet seasons or at high tide, and typically remains waterlogged at all times.

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a piece of land surrounded by water.

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a deep inlet of the sea almost surrounded by land, with a narrow mouth.

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a mound or ridge of sand or other loose sediment formed by the wind, especially on the sea coast or in a desert.

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A bluff is a type of broad, rounded cliff. Most bluffs border a river, beach, or other coastal area.

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a deep gorge, typically one with a river flowing through it.

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More Than A View - Grand Canyon In Depth Episode 01

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a loosely compacted yellowish-gray deposit of windblown sediment of which extensive deposits occur, e.g., in eastern China and the American Midwest.

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"Loess" is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. It covers about 10% of the Earth's surface. Loess is an aeolian sediment formed by the accumulation of wind-blown silt, typically in the 20-50 micrometer size range, twenty percent or less clay and the balance equal parts sand and silt that are loosely cemented by calcium carbonate.

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an area of relatively level high ground.

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a low area of land between hills or mountains, typically with a river or stream flowing through it.

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a naturally raised area of land, not as high or craggy as a mountain.

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a large area of flat land with few trees.

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a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.

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a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.

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a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.

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a large natural stream of water flowing in a channel to the sea, a lake, or another such stream.