(A) Inexhaustible Resources : They are found with unlimited amounts in the nature. They cannot be depleted or exhausted even by their excessive use. Example: Sun energy, Wind energy, Atomic energy, Tidal energy etc.
(B) Exhaustible Resources : They are found with limited amounts. They can be exhausted by their excessive use. They are of two types
(a) Renewable Resources : They are the biological resources such as agriculture, forest grass land, animals etc. They can be used repeatedly because they are replaced naturally by growth or reproduction.
(b) Non-renewable Resources : They are the abiotic resources which cannot be readily replaced by natural means. Such as fossil fuels [petroleum, coke (coal), gas], mineral metals (copper, gold, silver etc). They can’t be replenished because their formation takes billions of years. They will be exhausted by their excessive use.
