Structural plains


Structural plains

Structural plains are mainly formed by the uplift of a part of the sea-floor or continental shelf.

These are located on the borders of almost all the major continents.

The south-eastern plain of the United States formed by the uplift of a part of the Gulf of Mexico is an example of this type of plain.

The structural plains may also be formed by the subsidence of areas.

One such plain is the central low-lands of Australia.

 

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Erosional Plains

Erosional Plains are formed by the continuous and a long-time erosion of all sorts of upland.

The surface of such plains is hardly smooth.

These are therefore also called peneplains which mean almost a plain.

The Canadian shield and the West Siberian plain are examples of erosional plains.

Depositional plains

Fragments of soil, regolith, and bedrock that are removed from the parent rock mass are transported and deposited elsewhere to make on an entirely different set of surface features–the depositional landforms.

When plains are formed by river deposits, they are called riverine or alluvial plains.

The Indo Gangetic plain of the Indian sub-continent, the Hwang-Ho Plain of North China, the Lombardy Plain of the Po River in Italy and the Ganga-Brahmaputra Delta Plain in Bangladesh are examples of alluvial plains.

The deposition of sediments in a lake gives rise to a lacustrine plain or a lake plain.

The Valley of Kashmir and that of Manipur are examples of two most prominent lacustrine plains in India.

When plains are formed by glacial deposits they are called glacial or drift plains.

Plains of Canada and North-Western Europe are examples of glacial plains.

When the wind is the major agent of deposition, they are called loess plains.

Loess plains of North-Western China are formed by the deposits of loessair- borne fine dust particles.

 

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