mountain - a very high piece of land, valley - an area of low ground between two hills, hill - a raised area or mound of land, volcano - a mountainous vent in the Earth's crust. When it erupts, it spews out lava, ashes, and hot gases from deep inside the Earth., plains - flat lands that have only small changes in elevation, cave - a large hole in the ground or in the side of a hill or mountain, river - a large, flowing body of water that usually empties into a sea or ocean, lake - a large body of water surrounded by land on all sides, canyon - a deep valley with very steep sides - often carved from the earth by a river, waterfall - when a river falls off steeply, ocean - a large body of salt water that surrounds a continent, island - a piece of land that is surrounded by water, desert - a dry, barren area of land, especially one covered with sand,

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