16) Tertiary period had five epochs, Select the correct order in which these epochs appeared in the geological time scale from ancient to more recent times:

17) The multipurpose Sardar Sarovar Project is being built across which river ?

18) _____ are the second major source of irrigation in India.

19) Which crop of the following has largest percentage of irrigated area of its net sown area in India?

20) True desert in Rajasthan is known as -