Petroleum is a renewable resource as it is naturally renewed in a million years.

The process of conversion of wood into coal is called _____.

_____ is the variety of coal with maximum carbon content.

Name one non-polluting fuel for vehicles.

What is the colour of the crude oil pumped out from a well?

Which petroleum product is used for surfacing roads?

Name the petroleum product used to manufacture candles, vaseline, grease, polish, etc.