Explain the formation of soil. What is top soil? Why is it important?

(N/A) $(i)$ Soil is formed through the process of weathering,where rocks at or near the Earth's surface are broken down over long periods by physical,chemical,and biological factors.
$(ii)$ Topsoil is the uppermost layer of the soil profile,which is rich in humus,organic matter,and living organisms,along with fine soil particles.
$(iii)$ It is important because it provides essential nutrients for plant growth,supports the biodiversity of the area,and acts as a habitat for various microorganisms.