Climatology, Atmosphere and Weather — NDA Geography

This is one of the heavyweight chapters in NDA Geography — 65 PYQs across 2017–2026, and the densest-HARD recall strand, because the paper blends two demands: it asks you to TRACE A PROCESS (why does the Coriolis force vanish at the equator? how does a cold front spawn thunderstorms? why is the outer atmosphere hottest yet feels cold?) and to RECALL A NAMED FACT (which local wind is the Mistral? what does Koppen's 'Cfa' mean?). So the chapter teaches in one long arc, from the air column outward and from cause to consequence: (1) Atmospheric layers, composition and aurora — the five shells of the atmosphere, what each is made of, and the solar-wind light show; (2) Insolation, temperature and solar geometry — how the Sun heats the Earth, the lapse rate, and temperature inversion; (3) Atmospheric pressure and winds — pressure belts, the Coriolis force, geostrophic and planetary winds; (4) Humidity, condensation, clouds and precipitation — water in the air, the cloud families, and how rain/snow/sleet/hail form; (5) Cyclones, fronts and local winds — tropical vs temperate cyclones, warm/cold fronts, and the named local winds; (6) Climate classification and zones — Koppen's letter codes and the world's climatic regions. Around 25 concepts, every PYQ tagged. The mechanism concepts (Coriolis, fronts, lapse rate, cyclogenesis) carry most of the HARD marks; the named-fact tables (layers, local winds, Koppen codes, cloud types) are pure recall you must drill to reflex.