Explain the types of depositional plains.

The types of depositional plain are:

1. Alluvial plains — These are formed by gradual accumulation of silt brought down by rivers. These deposits may be fan shaped known as Piedmont alluvial fan. When the river widens its valley or overflows its banks during floods, the clay and sand deposit to make flood plains. Examples are Indo-Gangetic plains, Plains of northern China and Mississippi plain. At the mouth of a river, triangular shaped plain of deposited material is called delta plain.
2. Glacial deposits — When the glaciers melt, the debris are deposited. Such plains are extensive in size and very fertile. They have irregular surface. For example, Plains of Central North America and Western European plain.
3. Aeolion Loess Plains or deposition by winds — These plains are formed by the materials which have been transported or deposited by winds. For example, Loess deposits of North China.
4. Lacustrine plains or river deposits — These plains result from the fillings of lake beds. When rivers enter a lake, they are muddy. The plains of Hungary in Europe and the plains of surrounding great lakes of North America are examples.