Tag: biology

Loss of the top layer of soil is called soil erosion. it is due to a variety of factors like rapidly flowing wind, water etc. 

Roots of trees hold the soil particles and prevent their loss. When trees are cut on a large scale land becomes barren. This results in the loss of upper soil layer due to heavy wind or flowing water leading to soil erosion. Hence afforestation prevents soil erosion. Thus the correct answer is option A.  

• Soil erosion is the loss of the fertile soil due to an absence of plants which can hold the soil. 
• The roots of the plants allow the soil to be held due to the presence of water. In deforestation, there is the cutting or the removal of plants. 
• Due to which the water present in the soil gets evaporated resulting in a barren land. 
• This barren land is prone to soil erosion which results in the loss of the upper layer of the soil.
  
  

(a) Top soil is the vital part of the soil and serves as the chief source of nutrition for plants. Loss or disturbance of top soil by natural agents like water, wind, gravity or ice is called soil erosion.

Sheet erosion is the uniform removal of soil in thin layers by the force of raindrops, heavy rain is responsible for sheet erosion.