Some area of our world are situated similarly of sea level those are called the Plain. The plains covered 50% area of our land. 
As we all know the plains are the only one where population can live more happily cause of on the plain area, mostly the communication system is better and the climate also charm full. For the reason mostly we all like to live in plain area.
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.
[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 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.
>>Wikipedia
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>> Formation of Plains:-
• Many down area are fill up by the river's silt and turned into a plain.
• On the earth's surface, where till now no fold is appeared there also create plain area.
• Some natural calamity like wind, river, glacier,rainfall broke the high area and turned into a plain.
• Earthquake also able to create a plain.
>> Characteristics of Plains:-
• The height of the plains from the sea level 300m.
• It is mostly found on the sea side & on the basins area of the world.
• The rivers flow slowly in the plain side.
• Exactly the plains are more found on Asia, Europe and North America. In Africa the number of plains are low. The world's largest plain is exist in the northern side of Eurasia.
There are four type of plain on the earth - [1] Depositional Plain, [2] Tectonic Plain, [3] Erosional Plain, [4] Plain by erosion by wind.
(1) Dispositional Plain:-
Sometimes for the natural calamity the land is erosion,then the silt, soil and sand gathered on a lower place and turned into a Dispositional Plain.• Alluvial Plain - Tigris basin, Mekong basin, Yangtze kiang Basin etc.
• Flood Plain - Coast of Indus river, coast of Brahmaputra river etc.
• Deltaic Plain - Ganges river (India), Brahmaputra river, Nile (Egypt), Mississippi river (North America), Yangtze kiang river ( China) etc.
• Coastal Plain - Bay of Atlantic and Mexico, Parish basin, the coastal plain of North America is the world largest coastal plain (length 160-500 km and wide 3000 km).
• Glacial Plain - In is found North America, Europe and mostly northern side of Asia.
• Loess Plain - The loess plains are mostly found Sahara, Algeria, Livia, hamada etc.
• Desert Plain or Bazada - In most cases it is found on Sahara desert on Africa.
(2) Tectonic Plain :-
Sometimes the ground growing up from the sea and set on the sea level then it is called the Tectonic Plain.
A pen that detect cancer by touch• Structural Plain - The northern area of Europe and Asia Continent, Commonwealth and independence States.
• Uplifted Plain - In most cases this plain is found Europe and steps area of Asia etc.
• Basin or Depressed Plain - The bay of Caspian sea, this plain is mostly exist under sea level.
(3) Erosional Plain :-
Wind, stream, sunshine and glacial, river these kind of natural calamity erosion the high place and catalyzed into a plain area that is called Erosional Plain.• Pene-plain or rolling plain - Ranchi, Hazaribag, Araballi, Durbazpur and the northern side of Finland.
• Wave-cut Plain - Bay of Norway.
• Glacial Erosional Plain - Ladakh plain, shield area and some place of Finland are erosion by the glacial.
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