Earth’s internal composition and Landforms — Social Science STD 7 — Question
Gujarat BoardEnglish MediumSTD 7Social ScienceEarth’s internal composition and Landforms3 Marks
Question
Explain the work of wind with examples.
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Answer
Wind is an active agent of erosion and deposition in a desert.
The wind in the desert region erodes the lower part of the rocks more easier and faster.
As a result, the lower part of the rocks is shallow and the upper part remains wider,
so these rocks make a shape like an Umbrella (Mushroom rocks), which is called 'Cap rock'.
In the desert region, wind carries sand from one place to another due to its velocity (speed).
When the speed of the wind is slowed down, the sand which is transported by the wind is deposited somewhere on the land and forms a small hill-like sand ridge, which is called 'Barchans'.
When the sand particles are and light in weight, the wind carries them hundreds of kilometres away.
Thus a level plain is formed on large area where these sand particles are transported and deposited by wind, which is called 'Loess' plain. Such plain is developed in the north-western China.
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