1.

Distinguish between the following (a) ‘Weathering’ and denudation. (b) ‘Mechanical Weathering’ and ‘Chemical Weathering’. (c) Sheet erosion and gully erosion.

Answer»

(a) Weathering : 

1. Weathering is the physical and chemical weathering of rocks due to mechanical and chemical action of water, wind and ice. 

Denudation : 

1.  Denudation includes both weathering and erosional proceses by which the natural agents of change (water, wind and ice), continously try to change the face of the earth. 

(b) Mechanical Weathering : 

1. It is done by the change in temperature and action of ice which breaks the rocks into small pieces. 

Chemical Weathering : 

1. It is done by oxidation hydration, carbonation and solution etc chemical processes which causes the breaking of rocks. 

(c) Sheet Erosion : 

1. Sheet Erosion causes washing out the upper layer of soil and vegetation cover due to heavy rainfall or floods.

Gully Erosion : 

1. Through gully erosion deep cuts, cracks and trenches are carved in the soil-bed, These tend to be deeper channels known as ‘gullies’.



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