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ICSE Class 7 Geography Question 6 of 21

Weathering and Soil Formation — Question 4

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Question

Question 5

Differentiate between:

(a) Chemical and mechanical weathering

(b) Weathering and denudation

Answer

(a) Difference between chemical and mechanical weathering:

S.
No.		Chemical weatheringMechanical weathering
1.It involves the breaking down of rocks by altering or dissolving the rock minerals due to chemical action or changesIt is responsible for the disintegration of rocks by the elements of weather such as heat, frost and wind.
2.The processes involved in chemical weathering are Oxidation, Carbonation, Hydration and Solution.The processes involved in mechanical weathering are Exfoliation, Granular disintegration and Block disintegration.
3.Chemical weathering is slow as compared to mechanical weathering.Mechanical weathering is comparatively faster.

(b) Difference between weathering and denudation:

S.
No.		WeatheringDenudation
1.Weathering involves disintegration and decomposition of rocks where they exist.Denudation involves both disintegration of rocks and transportation and deposition of the weathered material at some other place.
2.Weathering is a destructive process.Denudation is a destructive and constructive process.
3.Weathering is a static process.Denudation is a dynamic process.
4.Weathering is a short term process.Denudation is a long term process.