On the basis of availability, natural resources are classified as:
1. Renewable resources
2. Non renewable resources
Renewable resources
The resources which can be renewed along with their exploitation and always available for use are called as renewable resources.
Solar radiation, wind, tide, deep earth heat etc. are examples of renewable resources.
Non renewable resources
The formation of some resources like Iron ore, mineral oil, coal, petrol, diesel etc. are taken several thousand years. Once they are used in unlimited way, they cannot be easily replaced. Thus, exploitation at large scale result in their fast depletion. Such resources are called non renewable resources.
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