Preliminary Examination: Current events of national and international importance, Geography. Mains Examination: General Studies-I, III: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclones etc., disaster management. What’s the ongoing story: At least 153 people have been killed in Sri Lanka after landslides and flooding caused by Cyclone Ditwah, officials said on Saturday, with 191 others missing and more than half a million affected nationwide. Key Points to Ponder: — What is a cyclone and what are its types? — What are the favourable conditions for the formation of tropical cyclones? — What are tropical depressions? — What is...