how are Plans formed?
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For other uses, see Plain (disambiguation) and Plains (disambiguation).

Mount Ararat in the Caucasus, with the Ararat plain in foreground.
In geography, a plain is a flat, sweeping landmass that generally does not change much in elevation. Plains occur as lowlandsalong the bottoms of valleys or on the doorsteps of mountains, as coastal plains, and as plateaus or uplands.[1]
In a valley, a plain is enclosed on two sides, but in other cases a plain may be delineated by a complete or partial ring of hills, by mountains, or by cliffs. Where a geological region contains more than one plain, they may be connected by a pass (sometimes termed a gap). Coastal plains would mostly rise from sea level until they run into elevated features such as mountains or plateaus.[2]
Plains are one of the major landforms on earth, where they are present on all continents, and would cover more than one-third of the world’s land area.[3] Plains may have been formed from flowing lava, deposited by water, ice, wind, or formed by erosion by these agents from hills and mountains. Plains would generally be under the grassland (temperate or subtropical), steppe (semi-arid), savannah (tropical) or tundra (polar) biomes. In a few instances, deserts and rainforests can also be plains.[4]
Plains in many areas are important for agriculture because where the soils were deposited as sediments they may be deep and fertile, and the flatness facilitates mechanization of crop production; or because they support grasslands which provide good grazing for livestock.[5]

Mount Ararat in the Caucasus, with the Ararat plain in foreground.
In geography, a plain is a flat, sweeping landmass that generally does not change much in elevation. Plains occur as lowlandsalong the bottoms of valleys or on the doorsteps of mountains, as coastal plains, and as plateaus or uplands.[1]
In a valley, a plain is enclosed on two sides, but in other cases a plain may be delineated by a complete or partial ring of hills, by mountains, or by cliffs. Where a geological region contains more than one plain, they may be connected by a pass (sometimes termed a gap). Coastal plains would mostly rise from sea level until they run into elevated features such as mountains or plateaus.[2]
Plains are one of the major landforms on earth, where they are present on all continents, and would cover more than one-third of the world’s land area.[3] Plains may have been formed from flowing lava, deposited by water, ice, wind, or formed by erosion by these agents from hills and mountains. Plains would generally be under the grassland (temperate or subtropical), steppe (semi-arid), savannah (tropical) or tundra (polar) biomes. In a few instances, deserts and rainforests can also be plains.[4]
Plains in many areas are important for agriculture because where the soils were deposited as sediments they may be deep and fertile, and the flatness facilitates mechanization of crop production; or because they support grasslands which provide good grazing for livestock.[5]
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