Physical Features of India

Overview

Physical Features of India forms a core geography component in Bihar TET Paper II Social Studies. This topic tests your understanding of India's diverse landforms—mountains, plains, plateaus, rivers, and climate patterns—and how they influence human settlement, agriculture, and economic activities.

For the exam, expect direct factual questions on mountain ranges, river systems, plateau boundaries, and climate types. Questions often link physical features to Bihar's geography, so understanding how the Northern Plains and Gangetic system relate to Bihar is essential. Mastery requires memorizing key elevations, river origins, and regional boundaries while understanding the causal relationships between landforms and climate.

The topic typically carries 3–5 questions and frequently appears in map-based or matching-type formats. Focus on classification, location, and characteristic features rather than minor details.

Key Concepts

• **Six Major Physiographic Divisions**: India is divided into the Himalayan Mountains, Northern Plains, Peninsular Plateau, Indian Desert, Coastal Plains, and Islands. Each has distinct geological origins and characteristics.

• **Himalayan Formation**: The Himalayas formed due to collision of the Indo-Australian Plate with the Eurasian Plate about 50 million years ago. They are young fold mountains, still rising, and prone to earthquakes.

• **Three Parallel Himalayan Ranges**: From north to south—Himadri (Greater Himalayas, average 6000m), Himachal (Lesser Himalayas, 3700–4500m), and Shiwaliks (Outer Himalayas, 900–1100m). Valleys like Kashmir and Kullu lie between these ranges.

• **Northern Plains as Alluvial Deposits**: Formed by depositional work of Indus, Ganga, and Brahmaputra rivers. Divided into Bhabar (pebble zone), Terai (marshy), Bhangar (old alluvium), and Khadar (new alluvium/flood plains).

• **Peninsular Plateau Antiquity**: One of the oldest landmasses, part of Gondwanaland. Composed of igneous and metamorphic rocks. Divided into Central Highlands (north of Narmada) and Deccan Plateau (south of Narmada).

• **Monsoon-Dominated Climate**: India's climate is primarily influenced by the southwest and northeast monsoons. The Himalayas block cold Central Asian winds and force monsoon clouds to precipitate.

• **River Systems Classification**: Himalayan rivers are perennial (snow-fed), while Peninsular rivers are seasonal (rain-fed). Himalayan rivers are younger with active erosion; Peninsular rivers flow in established valleys.

Formulas / Key Facts

| Feature | Key Facts to Remember | |---------|----------------------| | Highest Peak | K2 (8611m) in India; Kanchenjunga (8586m) entirely in India | | Longest River | Ganga (2525 km within India) | | Largest Plateau | Deccan Plateau | | Northern Plains Length | About 2400 km, width 150–300 km | | Western Ghats | Average height 900–1600m; higher than Eastern Ghats | | Eastern Ghats | Discontinuous; average height 600m | | Highest Plateau | Ladakh Plateau (average 5000m) | | Major Passes | Karakoram, Shipki La, Nathu La, Bomdila | | Ganga Origin | Gangotri Glacier (as Bhagirathi) | | Brahmaputra Origin | Chemayungdung Glacier near Mansarovar | | Annual Rainfall Range | 100 mm (Rajasthan) to 11,000 mm (Mawsynram) | | Monsoon Months | June to September (SW monsoon) |