Physical Features of India — Study Notes

1. Introduction

India is a land of vast diversity. Its physical features range from the snow-capped peaks of the Himalayas in the north to the sandy shores of the Indian Ocean in the south, and from the Thar Desert in the west to the evergreen forests of the northeast. These diverse physical features are the result of millions of years of geological processes — the movement of the earth's crust, volcanic activity, weathering, and erosion.

The physical features of India have shaped the lives of its people in countless ways. The fertile plains of the north support a large agricultural population, the peninsular plateau is rich in minerals, and the long coastline supports trade, fishing, and tourism. This chapter explains how the major physiographic divisions of India came into being and describes each of them in detail.

2. Formation of the Physical Features: The Theory of Plate Tectonics

2.1 The Plate Tectonic Theory

According to the theory of plate tectonics, the crust (upper part) of the earth has been formed out of seven major and some minor plates. These plates are in constant motion. When these plates collide, they may cause the folding of rocks along their margins, forming mountains. When two plates move apart, they create cracks in the crust, and the land between the cracks rises to form plateaus.

2.2 The Three Major Movements

The movement of the plates results in three types of plate boundaries: convergent boundaries, where plates collide with each other; divergent boundaries, where plates move apart; and transform boundaries, where plates move horizontally past each other. These movements have been responsible for the formation of the major landforms of the world.

2.3 Formation of the Himalayas

The oldest landmass of India, the Peninsular Plateau, was part of the Gondwana land, which included the present-day South America, Africa, Australia, and Antarctica. Around 200 million years ago, the Gondwana land split, and the Indian plate moved northwards and collided with the much larger Eurasian plate. This collision, which began around 40-50 million years ago, caused the Tethys sea to be compressed, and the sediments were uplifted to form the Himalayan mountains and the Indo-Gangetic plain. The Himalayas are young, structurally folded mountains that are still rising.

3. Major Physiographic Divisions of India

India has the following major physiographic divisions:

1. The Himalayan Mountains
2. The Northern Plains
3. The Peninsular Plateau
4. The Indian Desert
5. The Coastal Plains
6. The Islands

3.1 The Himalayan Mountains

The Himalayas are the highest and one of the most recent mountain ranges in the world, stretching along the northern border of India. They run from the west to the east, and they are divided into three parallel ranges:

• The Himadri (Inner or Greater Himalaya): The northernmost range, which has the highest peaks, including Mount Everest (8,848 m), K2, and Kanchenjunga. These are perennially snow-bound, and many glaciers descend from here.
• The Himachal (Lesser Himalaya): Also called the Middle Himalaya, this range lies to the south of the Himadri and contains famous hill stations like Shimla, Mussoorie, Nainital, and Darjeeling.
• The Shiwalik (Outer Himalaya): This is the southernmost and lowest range of the Himalayas, made of unconsolidated rock material. The longitudinal valleys lying between the lesser Himalaya and the Shiwalik are known as 'Duns', such as Dehra Dun and Kotli Dun.

3.2 The Northern Plains

The northern plains lie between the Himalayan rivers in the north and the peninsular plateau in the south. These plains were formed by the alluvial deposits brought down by the rivers Indus, Ganga, and the Brahmaputra. The northern plains are the largest alluvial tracts of the world and are divided into three zones: the Bhabar (a narrow belt of pebbles along the foothills), the Terai (a marshy, damp zone where streams re-emerge), and the alluvial plains made up of older alluvium (bangar) and newer alluvium (khadar). These plains are extremely fertile and support a dense population.

3.3 The Peninsular Plateau

The Peninsular Plateau is a tableland composed of the old crystalline, igneous, and metamorphic rocks. It was formed due to the breaking and drifting of the Gondwana land. It is one of the oldest landmasses of the world. The plateau is divided into the Central Highlands and the Deccan Plateau. The Central Highlands lie to the north of the Narmada river, with the Malwa Plateau in the west, and the Chotanagpur Plateau in the east. The Deccan Plateau lies to the south of the Narmada, bordered by the Western Ghats and the Eastern Ghats. The Western Ghats are higher and continuous, while the Eastern Ghats are lower and discontinuous, and are joined by a series of discontinuous hills. The plateau is rich in minerals like coal, iron ore, and manganese.

3.4 The Indian Desert

The Indian Desert lies to the western margins of the Aravalli Hills. It is an undulating sandy plain covered with sand dunes. This region receives very low rainfall, below 150 mm per year, and has a dry and sandy climate. The vegetation is sparse, and the Luni river is the only large river in this region.

3.5 The Coastal Plains

The eastern and western coasts of the peninsular plateau are called the eastern coastal plains and the western coastal plains. The western coastal plains are narrow, with the northern part called the Konkan coast, the central part called the Kannad plain, and the southern part called the Malabar coast. The eastern coastal plains are broad and level, with deltas formed by the rivers like the Mahanadi, the Godavari, the Krishna, and the Kaveri. The northern part of the eastern coast is called the Northern Circar and the southern part is called the Coromandel coast.

3.6 The Islands

India has two groups of islands: the Andaman and Nicobar Islands in the Bay of Bengal and the Lakshadweep Islands in the Arabian Sea. The Andaman and Nicobar Islands are an elevated portion of submarine mountains, and the Lakshadweep Islands are a group of coral islands, which are a major attraction for tourists.

Quick Revision Tables

Table 1: Major Physiographic Divisions

Table 2: Himalayan Ranges and Their Peaks

Table 3: Important Terms

Mind Map

Important Diagrams (SVG)

Diagram 1: The Major Physiographic Divisions of India

Diagram 2: Formation of the Himalayas (Plate Collision)

Common Mistakes

1. Students often say the Himalayas are the oldest mountains. The Himalayas are young, folded mountains, while the Peninsular Plateau is the oldest landmass.
2. Many write that Mount Everest is in India. Mount Everest lies in Nepal; the highest peak within India is K2 (in the Karakoram range, located in the Jammu and Kashmir region).
3. A common error is to say the Northern Plains were formed by volcanic activity. They were formed by the alluvial deposits of the rivers Indus, Ganga, and Brahmaputra.
4. Students confuse the Western Ghats with the Eastern Ghats. The Western Ghats are higher and continuous, while the Eastern Ghats are lower and discontinuous.
5. Some students state that the Lakshadweep islands are volcanic. They are coral islands, while the Andaman and Nicobar islands are an elevated portion of submarine mountains.
6. It is wrong to say the Indian Desert receives high rainfall. It receives very low rainfall, below 150 mm per year.
7. Many students forget that the Gondwana land included not only India but also South America, Africa, Australia, and Antarctica.
8. Students often confuse bangar (older alluvium) with khadar (newer alluvium). Bangar is older and has a higher concentration of kankars.

Exam Tips

1. Start answers on physical features with the plate tectonic theory to explain the formation of landforms.
2. Draw or describe the three Himalayan ranges — Himadri, Himachal, and Shiwalik — with at least one example of a peak or hill station for each.
3. For the Northern Plains, mention Bhabar, Terai, bangar, and khadar to show detailed knowledge.
4. Compare the Western and Eastern Ghats explicitly when asked about the Peninsular Plateau.
5. Use correct figures, such as rainfall below 150 mm for the desert and Mount Everest at 8,848 m.
6. For map work, practise marking the physiographic divisions, the Ghats, and the island groups.
7. Relate each division to its economic importance (fertility of plains, minerals of plateau, tourism of islands).

Conclusion

The physical features of India are the product of billions of years of geological evolution, driven by the movement of the earth's tectonic plates. The collision of the Indian and Eurasian plates gave rise to the mighty Himalayas and the fertile Northern Plains, while the ancient Gondwana land forms the mineral-rich Peninsular Plateau. The Indian Desert, the coastal plains, and the island groups complete a land of remarkable variety. These physical divisions are not just features on a map; they determine the climate, agriculture, settlement, and economy of different regions of the country. Understanding them helps students appreciate the unity in diversity that characterises India — a land where the snow-clad mountains, green plains, dry deserts, and sunny coasts all exist within a single country.