Resources present in unlimited quantity in nature and are not likely to be exhausted by human activities are called

Coal, Petroleum and natural gas are examples of

Naphthalene balls used to repel moth and insect is derived from

CNG is the abbreviated form of

The slow process of conversion of dead vegetation into coal is called

In India petroleum deposit was first found in the state of

Use of CNG in automobile is better than petrol because it is

To reduce fuel consumption in automobile one should

Black gold is actually

The earth’s temperature is increasing due to Global warming which is due to