Burning of fossil fuels results in the formation of  ________

_______ coal has the least carbon content.

Petroleum provides ___________ percent of the energy requirements.        

Which one is the fossil fuel ?

The remains of dead plants animals which long ago and got buried inside the earth are called _______

Crude oil is formed from tiny sea creatures called _________. 

_______ is a hard, black colored rock-like substance.

The name of petroleum means oil of ____________

The energy from water is called _________ energy.

_________ is the fossil record of the whole forests