_________ sources of energy that do not get exhausted.

Study of fossils ________ .

Which one is the fossil fuel ?

Name the major constituents of coal gas

Petroleum is separated into various fractions by _______

Who is considered as the father of palaeontology?            

________ is the process of dissolving and replacement of the original minerals in an object with other minerals. 

The gas obtained when coal is heated strongly in the absence of air is called __________

Coal provides ________ percent of the energy requirements.

_________ is the preserved remains of dead organisms from past geological ages.