mountains - landform that rises about 1000 feet above surrounding areas, formed by tectonic forces, plateau - flat, elevated landform that rises sharply above surrounding areas, formed by tectonic forces, plains - broad area of flat land, formed by erosion , delta - wetlands that form when rivers empty their water and sediment into another body of water, formed by soil building and erosion, island - a body of land surrounded by water, formed by tectonic forces or volcanism, atolls - a circular type of coral reef, formed when a ring of coral surrounds an underwater volcano, fjord - a long, deep, narrow body of water that reaches far inland, formed by glacier erosion, canyon - deep, narrow valley with steep sides formed by water erosion, valley - depressed areas of land, washed out by glacial erosion and tectonic forces,

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