The __________ minerals are the most valuable minerals.

Which among the following place is a major steel producing factory ?

The mineral deposits in North America are located in ____________ zones. 

The _________ minerals contain metal in raw form.

How many types of coal are there ?

________ is required to make petrol .

_____________ is the largest producer of bauxite in the world.

The  _________ minerals do not contain metals.

___________ play an important role in the development of human life.

In some oil fields, ________ is found along with mineral oil.