Question

Give reasons for the following : 

1. Change of temperature leads to physical weathering. 

2. Presence of water aids chemical weathering. 

3. Human activities encourage weathering. 

4. Climate is the most important factor of soil formation. 

5. Farmers are encouraged to adopt soil conservation methods.

6. A soil dominated by clay makes tilling difficult. 

7. Grassland soils are less acidic than forest soils.

Answer 1

1. Change of temperature leads to physical weathering because it leads to expansion due to heating and contraction due to cooling. 

2. Presence of water aids chemical weathering because it dissolves soluble minerals present in the rocks. 

3. Human activities encourage weathering because these activities expose rocks to sun and rain due to which weathering takes place rapidly. 

4. Climate is the most important factor of soil formation because it controls the type of weathering of the parent rock arid availability of soil moisture for plants and micro-organisms. 

5. Farmers are encouraged to adopt soil conservation methods because it protects the top layer of the soil. 

6. A soil dominated by clay makes tilling difficult because it is sticky and tough. 

7. Grassland soils are less acidic than forest soils because grasses are heavy feeders on the bases.