(a) Define soil erosion. [2 marks] (b) List four factors that influence nutrient availability in the soil. [4 marks] (c) Explain two roles of each of the fo...

(a) Define soil erosion. [2 marks]

(b) List four factors that influence nutrient availability in the soil. [4 marks]

(c) Explain two roles of each of the following factors in soil formation: (i) climate; (ii) living organisms; (iii) topography. [6 marks]

(d) State four problems associated with overhead irrigation [4 marks]