Which is the largest open pit copper mine in the world?

What is found along with petroleum in some oil wells?

Rocks are made up of

Which one of the following state has largest deposit of iron ore?

Which one of the following city has petroleum refinery?

Where is oil refinery located in Kerala?

Petroleum refinery is found in

The naturally occurring substances that are obtained by mining or drilling are

The minerals such as petrol, coal, mica and limestone are

Rocks that contain enough of a mineral to be mined for profit are called