On the basis of their mode of formation, plains can be classified into structural plains, erosional plains and depositional plains.
Structural plains: These plains are mainly formed by the uplift of a part of the seafloor or continental shelf. These are located on the borders of almost all the major continents.
Example: The southeastern plain of the United States was formed by the uplift of a part of the Gulf of Mexico.
Erosional plains: These plains are formed by the continuous and long time erosion of all sorts of upland. The surface of such plains is hardly smooth. These are therefore also called peneplains which means almost a plain.
Example: Canadian shield and the West Siberian plain
Depositional plains: These plains are formed by the deposition of sediments brought down by rivers, glaciers and winds.
Example: The Indo Gangetic plain
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