Consider the following statements regarding trade winds: i) Trade winds blow from the subtropical high-pressure belt to the equatorial low-pressure belt. ii) Land and sea breezes are examples of trade winds. iii) Trade winds blow steadily in the same direction and in a constant course. iv) Trade winds are best developed in the polar regions. Which of the statements given above are correct?

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?