निम्नलिखित कथनों पर विचार कीजिए: I. डोलड्रम भूमध्यरेखीय शांत क्षेत्र हैं जहां हवाएं कमजोर और शांत होती हैं। II. उत्तरी गोलार्ध में प्रचलित व्यापारिक हवाओं की दिशा उत्तर-पश्चिम होती है। उपरोक्त कथनों में से कौन सा/से सही है/हैं?

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?