Geography of India: Landforms, Climate, Soils and Economic Patterns
Geography tests India's physical framework and the links between landforms, climate, soil and human activity. Expect map-based identification, cause–effect explanations and matching of crops or industries to regions.
Physical divisions
- Himalayas: young fold mountains, three ranges (Himadri, Himachal, Shiwalik), perennial rivers fed by snow.
- Northern Plains: alluvial, formed by the Indus, Ganga and Brahmaputra systems; dense population and intensive farming.
- Peninsular Plateau: old, stable block with Deccan Trap lava; black soil and mineral wealth.
- Coastal plains and islands: Western coastal plain is narrow; Eastern is broad with deltas; Andaman and Nicobar are tectonic islands, Lakshadweep is coral.
Climate, soil and vegetation
- Southwest monsoon (June–September) brings most rain; retreating monsoon affects the east coast; winter rain in Punjab comes from western disturbances.
- Alluvial soil is fertile; black (regur) soil holds moisture and suits cotton; red soil develops on crystalline rock; laterite forms under heavy rainfall and leaching; arid soil dominates western Rajasthan.
- Vegetation follows rainfall: evergreen, deciduous, thorn, mangrove.
Worked example
Why is cotton concentrated on the Deccan lava plateau? Reasoning: black soil forms from weathered basalt, is clayey, retains moisture, and is rich in lime, iron and magnesia but poor in nitrogen and phosphorus. Cotton tolerates such soils, so the soil–crop link, not simply "hot weather", explains the pattern.
Traps that cost marks
- Calling the Aravalli or Western Ghats "young fold mountains".
- Assuming all alluvial soil is identical; khadar and bangar differ in fertility and age.
- Mixing the Western and Eastern Ghats: the Western Ghats are continuous and higher.
- Forgetting that the Eastern coastal plain is wider and has deltas.