Page 125 - SST Class 06
P. 125
Different mountains have varying shapes and be rugged and rocky and it
heights. Old mountains are low in height and may have steep sides. The
have rounded peaks, as the Aravalli. The rounded Deccan Plateau in South
peaks occur due to erosion. In comparison, new India extends for over
mountains have high and pointed peaks, as the thousands of kilometres. The
Himalayas. highest plateau in the world
Life in mountains is not easy, as it is difficult to is Tibet , so it is called the Southern Plateau
construct roads, railways, bridges and buildings. roof of the world .
Farming is not easy in mountains as well. This is As the land in a plateau is rocky and rugged, it is
the reason that mountains are sparsely inhabited. difficult to construct roads and railways. So, life is
Some mountain ranges are completely difficult here. But plateaus have rich deposits of
uninhabitable. minerals.
F ind Outind Out Activity
On the map of India mark different landforms with
What are the three types of mountains? different colours.
Quiz Time
Info Bits
Info Bits Fill in the blanks :
The largest river is the Amazon in South America in 1. A mountain is higher than the ________ areas.
terms of volume of water and size, while the Nile in
Egypt is the longest river extending to 6,695 km. 2. The total land area of Europe is about ________
sq. km.
Plains
3. The ________ of lithosphere ranges from 6 to
Plains stretch over long distances with a flat 60 km.
surface. They are generally below 200m the sea 4. Plateaus have rich deposits of ________ .
level. Plains have been formed by the rivers and
their tributaries which originate in mountains and 5. Asia and Europe together are called ________ .
bring with them sand and
soil. As the water current HYDROSPHERE
slows down in plains, sand Hydrosphere constitutes all water bodies on the
and soil are deposited on
Earth’s surface, such as oceans, seas, lakes, rivers,
the banks. Plains are ice-lines, glaciers etc. Due to abundance of
extremely level, but at
hydrosphere, the Earth is also termed as the blue
some places they may be planet or watery planet . This is the presence of
Northern Plains
rolling or undulating. water that makes the Earth a unique planet,
The soil brought by rivers is very fertile for crops. because water found in other planets is in frozen
This is the reason that plains are thickly inhabited form and cannot support life.
areas. Plains are also favourable for other About 71 percent of the Earth’s surface is covered
activities, like construction of roads, railways and with water. About 97 percent of the total water is
buildings. The plains in North India have been
found in oceans and the remaining water is
formed by three rivers (Ganga, Sutlej and present in other water bodies and atmosphere.
Brahmaputra) and their tributaries.
Just Think!
Plateaus
A plateau is a high flat land. Because of its flat We throw garbage on land or into water bodies. Is
surface, it is also called tableland . Its surface can this a right practice?
Major Domains of the Earth
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