Compare and contrast bio-mass and hydro-electricity as sources of energy.

Explanation

Biomass and hydro-electricity both are renewable sources of energy.
(i) Biomass is derived from dead plants and animal wastes. Hence, it is naturally replenished. It is the result of natural processes. Therefore, it is naturally replenished. Wood and gobar gas are some of the examples of biomass.
(ii) Hydro-electricity, on the other hand, is obtained from the potential energy stored in water at a height. Energy from it can be produced again and again. It is harnessed from water and obtained from mechanical processes.