In geography, a plain is a flat, sweeping landmass that generally does not change much in elevation. Plains occur as lowlands along the bottoms of valleys or on the doorsteps of mountains, as coastal plains, and as plateaus or uplands.
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 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.
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. 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.
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.
Types of plainEdit
- Structural plains are relatively undisturbed horizontal surfaces of the Earth. They are structurally depressed areas of the world that make up some of the most extensive natural lowlands on the Earth's surface.
- Erosional plains have been leveled by various agents of denudation such as running water, rivers, wind and glacier which wear out the rugged surface and smoothens them. Plain resulting from the action of these agents of denudation are called peneplains (almost plain) while plains formed from wind action are called pediplains.
- Depositional plains formed by the deposition of materials brought by various agents of transportation such as rivers, wind, waves, and glaciers. Their fertility and economic relevance depend greatly on the types of sediments that are laid down.
- Alluvial plains, formed by rivers, and may be one of these overlapping types:
- Alluvial plain, formed over a long period of time by a river depositing sediment on its flood plain or bed which becomes alluvial soil. The difference between a flood plain and an alluvial plain is that the flood plain represents the area experiencing flooding fairly regularly in the present or recently, whereas an alluvial plain includes areas where the flood plain is now and used to be, or areas which only experience flooding a few times a century.
- Flood plain, adjacent to a stream, river, lake or wetland that experiences occasional or periodic flooding.
- Scroll plain, a plain through which a river meanders with a very low gradient.
- Lacustrine plain, a plain that originally formed in a lacustrine environment, that is, as the bed of a lake.
- Lava plain, formed by sheets of flowing lava.
- Glacial plains, formed by the movement of glaciers under the force of gravity:
- Sandur (plural sandar), a glacial out-wash plain formed of sediments deposited by melt-water at the terminus of a glacier. Sandar consist mainly of stratified (layered and sorted) gravel and sand.
- Till plain, a plain of glacial till that forms when a sheet of ice becomes detached from the main body of a glacier and melts in place depositing the sediments it carries. Till plains are composed of unsorted material (till) of all sizes.
- Abyssal plain, a flat or very gently sloping area of the deep ocean basin.
- Planitia, the Latin word for plain, is used in the naming of plains on extraterrestrial objects (planets and moons), such as Hellas Planitia on Mars or Sedna Planitia on Venus.
- Nineveh Plains (Iraqi Kurdistan)
- Khuzestan Plain (Iran)
- Mugan plain (Iran and Azerbaijan)
- Al-Ghab Plain (Syria)
- Aleppo plateau (Syria)
- Israeli coastal plain (Israel)
- Shiraki Plain (Georgia)
- Ararat plain (Turkey and Armenia)
- Bhuikhel (Nepal)
- Terai (Nepal)
- Indo-Gangetic Plain (India, Bangladesh and Pakistan)
- Eastern coastal plains (India)
- Western coastal plains (India)
- West Siberian Plain (Russia)
- Kantō Plain (Japan)
- Nōbi Plain (Japan)
- Osaka Plain (Japan)
- Sarobetsu plain (Japan)
- North China Plain (China)
- Chianan Plain (Taiwan)
- Pingtung Plain (Taiwan)
- Yilan Plain (Taiwan)
- Depsang Plains (China)
- Kedu Plain (Indonesia)
- Kewu Plain (Indonesia)
- Mallig Plains (Philippines)
- Muddus plains (Sweden)
- Kaffiøyra (Svalbard, Norway)
- South Småland peneplain (Sweden)
- Stora Alvaret (Oland, Sweden)
- Cheshire Plain (England)
- The Fylde (Lancashire, England)
- North Northumberland Coastal Plain (Northern England)
- North Somerset Levels (North Somerset, England)
- Salisbury Plain (England)
- Solway Plain (Cumbria, England)
- Somerset Levels (Somerset, England)
- South Coast Plain (Sussex and Hampshire, England)
- North German Plain
- Westphalian Lowland (Germany)
- Pannonian Basin (Central Europe)
- Parndorf Plain (Austria)
- Limagne (France)
- Ochsenfeld (France)
- European Plain
- Great Hungarian Plain
- East European Plain
- Kosovo field (Kosovo)
- Bărăgan Plain (Romania)
- Wallachian Plain (Romania)
- Little Hungarian Plain (Hungary, Austria and Slovakia)
- Pannonian Steppe (Hungary)
- Danubian Plain (Bulgaria)
- Upper Thracian Plain (Bulgaria)
- Dnieper Lowland (Ukraine)
- Polesian Lowland (Ukraine and Belarus)
- Mesaoria (Cyprus)
- Agro Nocerino Sarnese (Italy)
- Campidano (Italy)
- Nurra (Sardinia, Italy)
- Po Valley (Italy)
- Rieti Valley (Central Italy)
- Tavoliere delle Puglie (Southern Italy)
- Lelantine Plain (Greece)
- Messara Plain (Greece)
- Bogong High Plains (Victorian Alps, Australia)
- Cumberland Plain (Sydney, Australia)
- Esperance Plains (Western Australia)
- Molonglo Plain (Australian Capital Territory)
- Mulga Lands (eastern Australia)
- Nullarbor Plain (Southern Australia)
- Ord Victoria Plain (Central Australia)
- Swan Coastal Plain (Perth, Australia)
- Awarua Plains (Southland)
- Canterbury Plains (Canterbury)
- Hauraki Plains (Waikato)
- Maniototo (Otago)
- Taieri (Otago)
- Great Plains (United States and Canada)
- Interior Plains (United States and Canada)
- Atlantic coastal plain (United States)
- Gulf Coastal Plain (United States and Mexico)
- Carrizo Plain (California, United States)
- Lake Superior Lowland (Wisconsin, United States)
- Laramie Plains (Wyoming)
- Mississippi Alluvial Plain (Mississippi)
- Oxnard Plain (Ventura County, California)
- Snake River Plain (Idaho)
Central and South AmericaEdit
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- Smith L.C., Sheng Y., Magilligan F.J., Smith N.D., Gomez B., Mertes L., Krabill W.B., Garven J.B., Geomorphic impact and rapid subsequent recovery from the 1996 Skeiðarársandur jökulhlaup, Iceland, measured with multi-year airborne lidar. Geomorphology vol. 75 Is. 1-2 (2006) 65-75
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