KERALA PSC / PHYSICAL GEOGRAPHY / CLASSIFICATION OF LANDFORMS / PLAINS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

 

KERALA PSC / PHYSICAL GEOGRAPHY / CLASSIFICATION OF LANDFORMS / PLAINS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

KERALA PSC / PHYSICAL GEOGRAPHY / CLASSIFICATION OF LANDFORMS / PLAINS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE

PLAINS

·      A relatively flat and a low-lying land surface with least difference between its highest and lowest points is called a plain.

·      The plains are usually lowlands

·      Plains can be placed according to their position and surface relief but are better classified on the basis of their mode of formation

·      They are sub-divided into structural, erosional and depositional plains.

 

STRUCTURAL PLAINS

·      These plains are formed by the uplift of a part of the sea floor usually boarding a continent, that is the continental shelf.

·      On the other hand, there are structurally depressed areas which make up very extensive lowlands on the earth.

 

EROSIONAL PLAINS

·      These are formed when an elevated tract of land, for instance, a mountain, a hill or a plateau is worn down to a plain by the process of erosion.

·      Over long ages, the higher land is levelled down into a sort of plain

·      The surface is hardly smooth and forms almost a plain termed as a peneplain

·      These are found in river, ice and wind eroded regions.

 

DEPOSITIONAL PLAINS

·      These plains are formed by the filling up of sediments into depressions along the foot hills, lakes and seas.

·      The deposition of sediments, eroded and brought down by large rivers, forms riverine alluvial plains

·      The Indo-Ganga plains in the Indian subcontinent is an example of alluvial plain.

 

·      Peneplains are formed by the wearing down of land due to weathering and erosion

 

·      Coastal plains are those parts of the continental shelf which have been uplifted

·      Glacial plains are formed through glacial erosion and deposition

·      Lacustrine plains are old lake beds and are made up of sediments deposited by rivers etc…

·      Karst plains are formed in limestone areas mainly by the agency of underground water

·      Flood plains, delta plains and alluvial plains are all formed through the deposition of eroded material by rivers.

KERALA PSC / PHYSICAL GEOGRAPHY / CLASSIFICATION OF LANDFORMS / PLAINS / NOTES / OBJECTIVE QUESTIONS / STUDY MATERIALS / GENERAL KNOWLEDGE