Geography

India’s six physical divisions, explained from one contrast: the oldest land and the youngest land sit side by side, and the rivers, soils and rains all follow from it.

82 degrees 30 minutes east sets the clock and the Tropic of Cancer sets the climate. Extent, area, the Kanyakumari trap, the eight Tropic states and the channels.

The monsoon is a wind reversal, not rain. IMD’s three onset conditions, the normal dates, the Long Period Average and the five rainfall categories, explained simply.

Indian soils follow the rock underneath and the rainfall above — learn that and the tables write themselves. The eight ICAR soil types, Khadar and Bhangar, crop seasons, what each crop needs, erosion, the colour revolutions and practice questions.

Indian rivers made easy: Himalayan vs Peninsular systems, the Indus and Ganga tributaries, why Narmada and Tapi flow west, river-city pairs, major dams with their rivers and states, important lakes and waterfalls, plus practice questions for SSC, RRB, Banking and State PSC exams.