Which one of the following is the correct sequence of proved coal reserves in the Indian States in decreasing order?

Consider the following statements relating to Richter scale

1. It was devised in 1935 by Charles F Richter.

2. It describes the quantity of energy released by a single earthquake.

3. Richter scale has no upper limit.

Which of the statement(s) given above is/are correct?

Which one of the following ocean currents is not a cold ocean current?

What is the time gap in occurrence of two successive tides at a given place on the ocean surface?