Biology (NTSE/Olympiad)  

6. Natural Resources


The top surface layer of this exposed, solid part of crust containing weathered minerals and humus and capable of supporting plant growth is called soil.
Soil Formation
The process of soil formation is so slow that the soil is regarded as a non-renewable resource.
It is the process of formation of soil from rocky earth’s crust. It involves following two processes:
Decomposition of organic matter and subsequent humification and mineralization.
Main factors that influence the formation of soil from the rocks are –

Temperature variations due to radiactions of the sun.
Rain water
Living organisms

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