UPSC / UPPSC Geography Optional
Paper–II (Indian Geography) – Page 1
Structure & Physiography of India
Shaktimatha 369 Learning
1. Introduction
India’s physiography is the result of a long and complex geological history. The interaction between ancient landmasses and young fold mountains has produced a remarkable diversity of relief features. Understanding the structure and physiography of India is fundamental for analysing climate, drainage, resources, agriculture, disasters and regional development.
2. Geological Structure of India
A. The Peninsular Block
The Peninsular Block is one of the oldest landmasses of the world. It is composed mainly of ancient crystalline rocks such as granite and gneiss belonging to the Archaean age. This region was a part of the ancient supercontinent Gondwanaland.
- Structurally stable and rigid
- Low seismic activity
- Rich in mineral resources
B. The Himalayan Mountain System
The Himalayas are geologically young fold mountains. They were formed due to the collision between the Indian Plate and the Eurasian Plate. The folding process is still continuing, making the region tectonically active.
- High seismic vulnerability
- Source region of major perennial rivers
- Frequent landslides and earthquakes
C. Indo-Gangetic Foredeep
The Indo-Gangetic Plain was formed due to the down-warping between the Himalayas and the Peninsular Plateau. It has been filled with thick layers of alluvium brought by Himalayan rivers over millions of years.
- Extremely fertile agricultural region
- High population density
- Flat and featureless relief
3. Major Physiographic Divisions of India
1. The Himalayan Mountains
Stretching over 2,400 km, the Himalayas form a natural northern boundary of India. They are divided into the Trans-Himalayas, Greater Himalayas, Lesser Himalayas and the Shiwalik ranges.
2. The Northern Plains
Formed by the depositional work of the Indus, Ganga and Brahmaputra rivers, the Northern Plains are flat, fertile and densely populated. They play a crucial role in India’s food security.
3. The Peninsular Plateau
The Peninsular Plateau is the oldest physiographic division of India. It consists of the Central Highlands and the Deccan Plateau, and is marked by rift valleys like Narmada and Tapi.
4. The Indian Desert
Located in western Rajasthan, the Thar Desert is characterised by arid climate, sand dunes and seasonal streams.
5. The Coastal Plains
India has two coastal plains: the Western Coastal Plain (narrow, with estuaries) and the Eastern Coastal Plain (wide, with deltas).
6. The Islands
The Andaman & Nicobar Islands are volcanic and tectonically active, while the Lakshadweep Islands are coral in origin.
4. Significance of Physiography
- Controls climate and rainfall patterns
- Influences drainage and river systems
- Determines agricultural regions
- Affects mineral and energy resource distribution
- Plays a role in disaster vulnerability
5. Answer Writing Strategy (Exam Focus)
- Begin with a simple India outline map
- Use clear headings and sub-headings
- Add one labelled diagram if possible
- Link physiography with economy and hazards
- Conclude with integrated significance
Golden Rule: Structure + Map + Application = High Marks
End of Geography Optional – Paper II | Page 1
Shaktimatha 369 Learning
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