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| 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’. | |