Which of the following statements about tropical cyclones is/are NOT correct? a. Tropical cyclones are formed in the 30° latitude region North and South of the equator. b. The diameter of a tropical cyclone can range from 300 to 1500 km and even more. c. Tropical cyclones can have wind speeds of 50 to 60 km per hour and even more. d. Tropical cyclones rotate in a clockwise direction in the Northern Hemisphere.

With reference to the Madden-Julian Oscillation (MJO), consider the following statements: I. It is an eastward-moving tropical disturbance rather than a stationary atmospheric trough. II. It is associated with alternating phases of enhanced and suppressed cloudiness, convection and rainfall. III. It generally operates within the tropical belt between 30°N and 30°S latitudes. IV. It can influence monsoon variability as well as tropical cyclone activity. Which of the statements given above are correct?

Which of the following correctly explains the formation of clouds in the atmosphere?