The almost level surface produced by the long-continued erosional work of rivers, close to base level, is called a:
- A.Pediplain
- B.Peneplain
- C.Structural plain
- D.Deltaic plain
Correct answer
Explanation
The correct answer is B, peneplain. A peneplain, meaning almost a plain, is the end stage of the normal cycle of river erosion in a humid region, when valleys have widened and divides have been worn down until the land lies close to base level, with a few resistant residual hills standing above it. Option A is wrong because a pediplain is the comparable surface in an arid or semi-arid region, produced by sheet wash and the backwearing of slopes rather than by rivers. Option C is wrong because a structural plain owes its flatness to the uplift of a part of the sea floor or to the subsidence of land, not to erosion. Option D is wrong because a deltaic plain is a depositional landform built where a river drops its load at its mouth, such as the Sundarbans.
Read the full article: Types of Mountains, Plateaus and Plains: Notes for Exams
Practice Questions
View allWhich of the following is the oldest fold mountain range of India?
- A.Himalayas
- B.Aravalli
- C.Satpura
- D.Nilgiri
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The Aravalli range of Rajasthan and Haryana is an old or relict fold mountain, folded in the Precambrian era and worn down by erosion to low, rounded hills; Guru Shikhar on Mount Abu is its highest point.
Read the full explanation →The Vosges and the Black Forest, which stand on either side of the Rhine rift valley, are examples of:
- A.Fold mountains
- B.Volcanic mountains
- C.Block mountains
- D.Residual mountains
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Block mountains are formed by tensional forces that break the crust along faults; the block left standing between or beside the faults is called a horst and the sunken trough is a graben or rift valley.
Read the full explanation →Mount Kilimanjaro, the highest peak of Africa, is an example of which type of mountain?
- A.Volcanic mountain
- B.Fold mountain
- C.Block mountain
- D.Residual mountain
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Kilimanjaro in Tanzania is a dormant volcano built up by repeated eruptions of lava and ash around its vents, and at 5,895 metres it is the highest point in Africa.
Read the full explanation →Which plateau is the highest and the most extensive plateau in the world, and is called the Roof of the World?
- A.Plateau of Tibet
- B.Deccan plateau
- C.Patagonia plateau
- D.Loess plateau
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Lying between the Himalayas on the south and the Kunlun on the north, it is an intermontane plateau, the highest and the largest in the world, with an average elevation of about four and a half thousand metres, which is why it is called the Roof of the World.
Read the full explanation →The Deccan Trap of Maharashtra, from which the black regur soil has formed, is an example of which type of plateau?
- A.Intermontane plateau
- B.Lava plateau
- C.Piedmont plateau
- D.Loess plateau
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The Deccan Trap was built by fissure eruptions of highly fluid basalt lava towards the close of the Cretaceous period, which spread as sheet after sheet over a vast area of western and central India; the weathering of that basalt gives the black cotton soil, also called regur.
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