Name the region in which India's main coalfields are located. What is the quality of coal found here? What are its uses?

State three advantages of dams.

With reference to the Bhakra Nangal Dam, answer the following:

(i) Name the river on which it has been constructed.

(ii) Name two states that benefit from this project.

(i) On which river is Hirakud Dam located?

(ii) Give any two uses of this dam.