NCERT Solutions for Class 6 Social Science Geography Chapter 3 : Motions of the Earth

Q:

(1) A ___________ is an unbroken flat or a low-level land. (2) The Himalayas and the Alps are examples of _______________types of mountains. (3) _____________ areas are rich in mineral deposits. (4) The _________________ is a line of mountains. (5) The ____________areas are most productive for farming.

A:

(1) A plain is an unbroken flat or a low-level land.

(2) The Himalayas and the Alps are examples of fold types of mountains.

(3) Plateau areas are rich in mineral deposits.

(4) The range is a line of mountains.

(5) The plain areas are most productive for farming.

Q:

(a) The mountains differ from the hills in terms of (i) elevation (ii) slope (iii) aspect (b) Glaciers are found in (i) the mountains (ii) the plains (iii) the plateaus (c) The Deccan Plateau is located in (i) Kenya (ii) Australia (iii) India (d) The river Yangtze flows in (i) the South America (ii) Australia (iii) China (e) An important mountain range of Europe is (i) the Andes (ii) the Alps (iii) the Rockies

A:

(a) (iii) aspect   ✓

(b) (i) the mountains  ✓

(c) (iii) India   ✓

(d) (iii) China   ✓

(e) (ii) the Alps ✓

 

Q:

(a) What are the major landforms? (b) What is the difference between a mountain and a plateau? (c) What are the different types of mountains? (d) How are mountains useful to man? (e) How are plains formed? (f) Why are the river plains thickly populated? (g) Why are mountains thinly populated?

A:

(a) The major landforms are mountains, plateaus and plains.

(b) 

Mountain

Plateau

A mountain is any natural elevation of the earth surface. It is considerably higher than the surrounding area.

A plateau is an elevated flat land. It is a flat-topped table land standing above the surrounding area.

The mountains may have a small summit and a broad base.

Plateaus have steep side and are flattened at the top.

For example: Mt. Everest

For example: Deccan Plateau

(c) There are three types of mountains- Fold Mountains, Block Mountains and the Volcanic Mountains.

(d) Mountains are very useful to men in the following ways:

  • The mountains are a storehouse of water. Many rivers have their source in the glaciers in the mountains.
  • Water from the mountains is also used for irrigation and generation of hydro-electricity.
  • The river valleys and terraces are ideal for cultivation of crops.
  • Mountains have a rich variety of flora and fauna.
  • The forests provide fuel, fodder, shelter and other products like gum, raisins, etc.
  • Mountains provide an idyllic site for tourists.
  • They visit the mountains for their scenic beauty.
  • Several sports like paragliding, hang gliding, river rafting and skiing are popular in the mountains.

(e) Most of the plains are formed by rivers and their tributaries. The rivers flow down the slopes of mountains and erode them. They carry forward the eroded material. Then they deposit their load consisting of stones, sand and silt along their courses and in their valleys. It is from these deposits that plains are formed.

(f)  Plains are very thickly populated regions of the world because plains are very fertile and construction of transport network is easy.

(g) Mountains are thinly populated because of harsh climate, steep slopes and less land is available for farming.

 

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