Explanation:

The major factors of soil formation are :
Parent Rock - Determines colour, texture, chemical properties, mineral, content, permeability.
Climate - Temperature and rainfall influence rate of weathering and humus.
Relief - Altitude and slope determine accumulation of soil.
Flora, Fauna and Microorganisms - All affect the rate of humus formation.
Time - Determines the maturity and thickness of the soil profile.
All these factors differ from place to place and over a period of time.