Download 7th Class Geography Notes (Unit-2) for Islamabad Model Schools & Colleges


SHORT QUESTIONS

What is the cause of Gully Erosion?
Gully erosion occurs by the abrasion and plucking of rock pieces.
Give an example of Biological Weathering.
Some animals develop holes or burrows into the rocks which causes the rock to break and disintegrate. For example worms, termites and other insects.
Define Chemical Weathering and give an example.
It is decomposition of rocks through chemical processes. Carbonation is the example of Chemical Weathering.
Briefly describe frost action on rocks.
· Disintegration of rocks due to melting of ice in the pore spaces and fractures of rocks is called frost action on rocks.
· When water in rock pores freezes, its volume increases which create a significant amount of pressure on rocks

LONG QUESTION

Define Erosion and write measures to check Erosion.
Erosion is the process in which moving agents like wind, water or glacier break rock surfaces and carry away the broken materials.
Measures to Check:
· Plantation of trees provides protection to surface.
· Construction of Embankments along nalas and river beds also check erosion.
Write a detailed account of Water Erosion.
Water is powerful agent of erosion. Streams and rivers widen and deepen their courses by erosion. Water erosion is carried out by three processes:
i) Hydraulic action
ii) Abrasion
iii) Solution.
What is a Mass Wasting? Give some measures to check Mass Wasting.
The sudden bulk transfer of rock materials downwards along the slope under the influence of gravity is called Mass Wasting.
Measures to Check:
· Reduce gradients of steeper slopes along roads;
  • Remove unstable rocks;
· Build retaining walls or structures to hold back possible slides;
· Construct more surface drainage channels and ditches;

7th Class Geography Notes for Islamabad Model Schools and Colleges

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Download Class Notes: Download 7th Class Geography Notes (Unit-2) for Islamabad Model Schools & Colleges
Download 7th Class Geography Notes (Unit-2) for Islamabad Model Schools & Colleges
Download 7th Class Geography Notes (Unit-2) for Islamabad Model Schools & Colleges
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