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In physical geography, a plateau is an area of land that is elevated significantly above the surrounding terrain and has a relatively flat or gently undulating surface. Unlike mountains, which are sharply elevated and rugged, plateaus are broad, flat highlands. They play a crucial role in shaping the landscape, influencing climate patterns, and supporting diverse ecosystems and human activities.
India's landscape is richly diverse, and plateaus form an important part of it. They cover large parts of peninsular India and act as a bridge between the towering mountains in the north and the vast plains in the north-central region. Understanding the major plateaus like the Deccan Plateau and the Central Highlands helps us appreciate India's physical geography and its impact on agriculture, mineral wealth, and settlement patterns.
Before diving into specific plateaus, let's understand what plateaus are, how they form, and their general features.
How do plateaus form?
General Characteristics of Plateaus:
The Deccan Plateau is one of the largest and most significant plateaus in India. It covers a major part of peninsular India and is known for its unique geological and physical features.
| Feature | Details |
|---|---|
| Location & Extent | South of the Narmada River, covering Maharashtra, Karnataka, Telangana, Andhra Pradesh, and parts of Tamil Nadu |
| Elevation | Ranges from 300 to 900 meters above sea level |
| Soil | Predominantly Black Soil (Regur), ideal for cotton cultivation |
| Rivers | Godavari, Krishna, Tungabhadra, and Cauvery flow across the plateau |
| Mineral Wealth | Rich in minerals like manganese, iron ore, coal, and bauxite |
Location & Extent: The Deccan Plateau occupies most of southern India, bounded by the Western Ghats on the west and the Eastern Ghats on the east. It extends from the Narmada River in the north to the southern tip of the peninsula.
Physical Features: The plateau is mostly flat but interspersed with hills and valleys. The black volcanic soil, known as Regur soil, is fertile and retains moisture well, making it excellent for agriculture, especially cotton farming.
Significance: The plateau supports a large agricultural economy due to its soil and river systems. Its mineral resources have spurred industries such as steel, mining, and power generation. The plateau's rivers are vital for irrigation and hydroelectric power.
The Central Highlands form a transitional plateau region between the Indo-Gangetic Plains to the north and the Deccan Plateau to the south. They are an important physiographic division of India.
Geographical Location: The Central Highlands lie mainly in the states of Madhya Pradesh and parts of Rajasthan and Uttar Pradesh. They are bounded by the Narmada River valley to the south and the Indo-Gangetic plains to the north.
Topography & Features: This region is characterized by a series of hill ranges such as the Vindhya and Satpura ranges. The terrain is undulating with plateaus, hills, and valleys. The elevation ranges from 500 to 900 meters.
Economic Importance: The Central Highlands are rich in minerals like coal, manganese, and copper. The forests provide timber and support biodiversity. The region is also important agriculturally, with crops like wheat, pulses, and oilseeds.
| Plateau | Location | Area (sq km) | Elevation (m) | Key Features |
|---|---|---|---|---|
| Deccan Plateau | South of Narmada River | ~1,900,000 | 300 - 900 | Volcanic soil, major rivers, mineral-rich |
| Central Highlands | Between Indo-Gangetic Plains & Deccan | ~500,000 | 500 - 900 | Vindhya & Satpura ranges, mineral deposits |
| Chota Nagpur Plateau | Jharkhand & adjoining areas | ~65,000 | 700 - 1100 | Rich in coal, iron ore, forested hills |
| Malwa Plateau | Western Madhya Pradesh | ~50,000 | 500 - 600 | Black soil, agriculture, part of Central Highlands |
Climate Influence: Plateaus affect local and regional climate by influencing wind patterns and rainfall distribution. For example, the Deccan Plateau's elevation causes the southwest monsoon winds to shed rain on the Western Ghats, creating a rain shadow region on the plateau's eastern side.
Biodiversity: The varied elevation and terrain of plateaus support diverse flora and fauna. Forests in the Central Highlands and Chota Nagpur Plateau are home to many wildlife species.
Human Settlement & Economy: Plateaus provide fertile soils and mineral resources that support agriculture and industry. Many cities and towns have developed on plateaus due to their strategic location and resource availability.
Step 1: Identify the Narmada River as a key boundary. The Deccan Plateau lies south of this river.
Step 2: Shade the large triangular area covering Maharashtra, Karnataka, Telangana, Andhra Pradesh, and parts of Tamil Nadu as the Deccan Plateau.
Step 3: Locate the region north of the Narmada River but south of the Indo-Gangetic Plains, mainly Madhya Pradesh, and mark it as the Central Highlands.
Answer: The Deccan Plateau covers most of peninsular India south of the Narmada, while the Central Highlands lie north of it, between the plains and the plateau.
Step 1: Identify key minerals found in the Deccan Plateau such as manganese, iron ore, coal, and bauxite.
Step 2: Recognize that these minerals are raw materials for industries like steel production, power generation, and aluminum manufacturing.
Step 3: Understand that mining activities provide employment and contribute to regional development.
Answer: The Deccan Plateau's mineral wealth supports major industries, boosts employment, and contributes significantly to India's industrial growth and economic development.
Step 1: Calculate the average elevation of the Deccan Plateau:
\[ \frac{300 + 900}{2} = \frac{1200}{2} = 600 \text{ meters} \]
Step 2: Calculate the average elevation of the Central Highlands:
\[ \frac{500 + 900}{2} = \frac{1400}{2} = 700 \text{ meters} \]
Step 3: Compare the averages.
Answer: The Central Highlands have a higher average elevation (700 m) than the Deccan Plateau (600 m), indicating a generally more elevated terrain.
Step 1: Understand that the Western Ghats, located on the western edge of the Deccan Plateau, intercept the southwest monsoon winds.
Step 2: As moist winds rise over the Western Ghats, they cool and cause heavy rainfall on the windward side.
Step 3: The eastern side of the Deccan Plateau lies in the rain shadow region, receiving much less rainfall.
Step 4: This creates a semi-arid climate on parts of the plateau, influencing agriculture and vegetation.
Answer: The Deccan Plateau, through its elevation and the Western Ghats, causes uneven monsoon rainfall, with heavy rains on the west and drier conditions on the east, shaping the region's climate and agriculture.
Step 1: Recall that Godavari, Krishna, and Tungabhadra flow through the Deccan Plateau.
Step 2: Chambal River flows through the Central Highlands and the Indo-Gangetic Plains, not the Deccan Plateau.
Answer: C) Chambal
When to use: When recalling characteristics of the Deccan Plateau quickly during exams.
When to use: To quickly remember key features of the Central Highlands.
When to use: When answering map-based questions or comparing plateaus.
When to use: While preparing for medium to hard level questions.
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