Physical Features of India — Practice

Question 1

Name the six physiographic divisions of India.

Accepted Answer

Step 1 — List.
  1. Himalayas (north).
  2. Northern Plains (north-central).
  3. Peninsular Plateau (central-south).
  4. Indian Desert (Thar, west).
  5. Coastal Plains (east and west coasts).
  6. Islands (Andaman & Nicobar in Bay of Bengal; Lakshadweep in Arabian Sea).

✦ Answer: Himalayas, Northern Plains, Peninsular Plateau, Indian Desert, Coastal Plains, Islands.

Question 2

Name the three parallel ranges of the Himalayas.

Accepted Answer

Step 1 — North to south.
  1. Himadri / Greater Himalayas (avg. altitude 6000+ m). Permanent snow.
  2. Himachal / Middle Himalayas (3700-4500 m). Hill stations.
  3. Shivaliks / Outer Himalayas (900-1100 m). Soft rocks.

✦ Answer: Himadri, Himachal, Shivaliks (from north to south).

Question 3

What is the difference between Bhabar and Tarai?

Accepted Answer

Step 1 — Bhabar.
  • Narrow belt at the FOOTHILLS of the Himalayas.
  • Composed of PEBBLES and coarse sediments brought down by rivers.
  • Rivers ENTERING this region DISAPPEAR into the porous pebble bed.
  • Width: about 8-10 km along the entire Himalayan front.

Step 2 — Tarai.
  • Belt SOUTH OF the Bhabar.
  • Wet, MARSHY, low-lying.
  • Rivers that disappeared into Bhabar RE-EMERGE here as streams.
  • Originally densely forested; now mostly cleared for agriculture.

Step 3 — Together they form a transition from mountains to plains.

✦ Answer: Bhabar is a narrow pebble belt at the Himalayan foothills where rivers disappear; Tarai is the wet, marshy belt south of Bhabar where these rivers re-emerge. Both are subdivisions of the Northern Plains.

Question 4

What is the difference between the Central Highlands and the Deccan Plateau?

Accepted Answer

Step 1 — Central Highlands.
  • NORTH of the Narmada River.
  • Includes the Aravalis (west), Vindhyas (south), and Bundelkhand/Baghelkhand (east).
  • Drained by Chambal, Betwa, Ken rivers (flowing north into the Yamuna/Ganga).

Step 2 — Deccan Plateau.
  • SOUTH of the Narmada River.
  • Triangular shape, bounded by Western Ghats (west) and Eastern Ghats (east).
  • Drained by Godavari, Krishna, Kaveri rivers (flowing east into the Bay of Bengal).

Step 3 — Common feature.
  Both are ancient land (Precambrian rocks, originally part of Gondwanaland).

✦ Answer: Central Highlands lie NORTH of the Narmada River (Aravalis, Vindhyas, Bundelkhand); Deccan Plateau lies SOUTH of the Narmada (Western/Eastern Ghats). Both are part of the ancient Peninsular Plateau.

Question 5

Where do the Western and Eastern Ghats meet?

Accepted Answer

Step 1 — Location.
  The Nilgiri Hills (Tamil Nadu/Karnataka/Kerala border) — also called the 'Blue Mountains.'

Step 2 — Significance.
  Where the two Ghats meet creates a region of high biodiversity. The Nilgiris are part of the Western Ghats biodiversity hotspot.

✦ Answer: The Western and Eastern Ghats meet in the Nilgiri Hills (Tamil Nadu/Karnataka/Kerala). The Nilgiris are part of the Western Ghats biodiversity hotspot.

Question 6

Why is the Himalayan range still rising today?

Accepted Answer

Step 1 — Pre-collision setup.
  140 million years ago, India was part of Gondwanaland. About 65 million years ago, the supercontinent broke up and India started drifting NORTHWARD at about 15 cm/year — unusually fast.

Step 2 — Collision (~50 million years ago).
  The Indian Plate crashed into the Eurasian Plate. The Indian Plate, being denser, slid UNDER the Eurasian Plate (subduction). The collision pushed the Eurasian Plate UPWARD — and the Himalayas were born.

Step 3 — Why it continues.
  The Indian Plate is STILL MOVING NORTHWARD at about 5 cm/year. The Eurasian Plate is still being pushed up by this collision. As a result:
  • The Himalayas are rising at about 5 mm per year.
  • This makes them YOUNG mountains (young = still being formed).
  • Earthquakes are frequent — the plates are constantly stressed.

Step 4 — Evidence.
  • Marine fossils found at high altitudes in the Himalayas — indicating the rock was once seafloor that was lifted.
  • Active fault lines along the Himalayan front cause regular earthquakes.
  • GPS measurements confirm continuing plate movement.

✦ Answer: The Indian Plate continues to push northward into the Eurasian Plate at ~5 cm/year. This ongoing collision lifts the Himalayas by ~5 mm/year. Marine fossils at high altitudes prove that the rock now mountains was once seafloor — beautifully demonstrating the geological process.

Question 7

Why are the Northern Plains so important economically and demographically?

Accepted Answer

Step 1 — Fertility.
  The Northern Plains are formed by alluvium deposited by Himalayan rivers (Indus, Ganga, Brahmaputra). This alluvial soil is among the most fertile on Earth — replenished annually by river flooding (in the Khadar belt).

Step 2 — Wheat and rice production.
  • Punjab, Haryana, Western UP: India's wheat bowl.
  • Eastern UP, Bihar, West Bengal: India's rice and jute belt.
  • Together, the Northern Plains produce ~60% of India's foodgrain.

Step 3 — Population density.
  ~40% of India's population (over 500 million people) live in the Northern Plains. Population density: among the highest in the world (~700 people/sq km in the Ganga Plain).

Step 4 — Major cities.
  Delhi, Lucknow, Kanpur, Patna, Kolkata, Allahabad/Prayagraj, Varanasi — major Indian cities all in the Northern Plains.

Step 5 — Historical centrality.
  Every major Indian civilisation (Indus Valley, Vedic, Mauryan, Gupta, Mughal, Delhi Sultanate) was centred in the Northern Plains. India's political and cultural heart.

Step 6 — Transport.
  Flat terrain enables: extensive railway network, highways, river transport. Easy mobility across the plains.

Step 7 — Modern challenges.
  • Pollution (Ganga, Yamuna).
  • Groundwater depletion (especially Punjab).
  • Floods (annual in some areas).
  • Urban congestion.

✦ Answer: The Northern Plains are India's most economically and demographically important region because they are: (i) extremely fertile (alluvial soil); (ii) India's primary foodgrain producer; (iii) host to ~40% of India's population and most major cities; (iv) historical centre of Indian civilisation; (v) connected by flat terrain enabling extensive transport.

Question 8

Why is the Peninsular Plateau rich in minerals?

Accepted Answer

Step 1 — Geological age.
  The Peninsular Plateau is composed of ancient (Precambrian) rocks — among the oldest in the world. These rocks were formed when Earth's interior heat was concentrated near the surface, allowing minerals to crystallise out of magma in concentrated deposits.

Step 2 — Mineral types found.
  • Iron ore — Karnataka (Bellary, Hospet), Odisha (Kendujhar, Sundargarh), Jharkhand.
  • Coal — Damodar Valley (Jharkhand, West Bengal), Singareni (Telangana).
  • Bauxite — Jharkhand, Odisha, Madhya Pradesh.
  • Manganese — Madhya Pradesh, Maharashtra, Odisha.
  • Copper — Khetri (Rajasthan), Singhbhum (Jharkhand).
  • Diamond — Madhya Pradesh (Panna), Andhra Pradesh.
  • Gold — Karnataka (Kolar, Hutti), Bihar.

Step 3 — Significance.
  The Peninsular Plateau hosts ~80% of India's mineral reserves. This is the foundation of Indian industry — iron and steel (Jamshedpur, Bhilai, Rourkela, Durgapur), copper, aluminum production.

Step 4 — Distribution patterns.
  Iron ore + coal are often near each other in the Chota Nagpur Plateau (Jharkhand) — making this region the heart of Indian heavy industry.

Step 5 — Economic implications.
  Mining in the Peninsular Plateau provides:
  • Industrial raw materials.
  • Employment for millions.
  • Foreign exchange (exports).
  • Also: environmental and social conflicts (displacement of tribal communities, ecological damage).

✦ Answer: The Peninsular Plateau is rich in minerals because its ancient (Precambrian) rocks formed when Earth's interior heat created concentrated mineral deposits. It hosts ~80% of India's mineral reserves — iron ore, coal, bauxite, manganese, copper, etc. — making it the foundation of Indian industry.

Question 9

Why is the Thar Desert located where it is, despite India's tropical climate?

Accepted Answer

Step 1 — Latitude factor.
  The Thar Desert is at 25-29° N latitude — within the global belt where SUBTROPICAL HIGH-PRESSURE systems descend. Earth's atmosphere has alternating high and low pressure bands at fixed latitudes. Around 30° N, descending air creates dryness — this is why all deserts at 30° N (Sahara, Arabian, Thar) exist.

Step 2 — Rain shadow.
  The Thar is in the RAIN SHADOW of:
  • The Aravali Mountains to the south. The Aravalis run roughly NE-SW, partially blocking south-westerly monsoon winds blowing toward the desert.
  • The Himalayas to the north. They block any moisture that might come from the north (Central Asia).
  Most monsoon rain falls before reaching the Thar — leaving it dry.

Step 3 — Distance from sea.
  Coastal areas receive more rainfall than interior areas. The Thar is in INTERIOR western India, far from the ocean. Marine moisture has been depleted by the time it could reach the Thar.

Step 4 — Topography.
  The flat-to-undulating terrain has nothing to force moist air to rise (which would cause condensation and rain). Without orographic lift, what little moisture reaches the area passes by without raining.

Step 5 — Temperature.
  At 27° N, the Thar gets intense summer heat (often 45-50°C). Hot air can hold more moisture without condensing — making rain even less likely.

Step 6 — Result.
  Annual rainfall in the Thar: 100-200 mm (very dry). Western Rajasthan often gets less than 100 mm in a year. Compare this to coastal Mumbai (~2,200 mm) at similar latitude.

✦ Answer: The Thar Desert exists because: (i) at 25-29° N, descending subtropical high-pressure dries air; (ii) it's in the rain shadow of the Aravali Mountains; (iii) it's far from the sea; (iv) flat terrain doesn't cause moist air to rise and rain; (v) intense summer heat further reduces precipitation. Result: <200 mm annual rainfall — among the driest regions in India.

Question 10

Compare the Western and Eastern Coastal Plains of India.

Accepted Answer

Step 1 — Location.
  WESTERN COAST: from Gujarat (north) to Kerala (south). Borders the Arabian Sea.
  EASTERN COAST: from West Bengal (north) to Tamil Nadu (south). Borders the Bay of Bengal.

Step 2 — Width.
  WESTERN: NARROW (50-100 km wide). The Western Ghats run close to the coast.
  EASTERN: WIDER (200-300 km wide). Eastern Ghats are further from the coast, leaving more plain.

Step 3 — Rivers.
  WESTERN: Rivers are SHORTER and don't form major deltas (because Western Ghats are close to the coast). Examples: Narmada, Tapi (drain into Arabian Sea); Mandovi, Zuari (Goa).
  EASTERN: Rivers are LONGER and form LARGE DELTAS. Mahanadi, Godavari, Krishna, Kaveri all form deltas in the Bay of Bengal.

Step 4 — Backwaters.
  WESTERN: Backwaters (lagoons connected to the sea) — especially in Kerala. World-famous tourist attractions.
  EASTERN: Less prominent backwaters; instead, large delta wetlands.

Step 5 — Subdivisions.
  WESTERN: Konkan (Maharashtra, Goa) + Karnataka coast + Malabar (Kerala).
  EASTERN: Coromandel Coast (Tamil Nadu, S. Andhra) + Northern Circars (N. Andhra, Odisha).

Step 6 — Major ports.
  WESTERN: Mumbai, Mormugao (Goa), Mangalore, Kochi.
  EASTERN: Chennai, Visakhapatnam, Paradip, Kolkata.

Step 7 — Climate.
  WESTERN: Heavy monsoon rains (Western Ghats trigger orographic rainfall). Konkan: 2500+ mm annual.
  EASTERN: Moderate to heavy rainfall, mostly during summer monsoon and retreating monsoon. Cyclones from the Bay of Bengal common.

✦ Answer: Western Coast is NARROW with short rivers and famous backwaters (Kerala). Eastern Coast is WIDER with long rivers forming large deltas (Mahanadi, Godavari, Krishna, Kaveri). Major ports on both coasts. Western Coast has heavier monsoon rains; Eastern Coast has more cyclone risk.

Question 11

Compare the Himalayas with the Peninsular Plateau on geological age, formation, mineral resources, and current activity.

Accepted Answer

Step 1 — Geological age.

HIMALAYAS: ~50 million years old. YOUNG mountains. Still forming.
  PENINSULAR PLATEAU: 600+ million years old (Precambrian). ANCIENT. Among the oldest landmasses on Earth.

Step 2 — Formation process.

HIMALAYAS: Formed by COLLISION between the Indian Plate (drifting northward) and the Eurasian Plate (50 million years ago). Folding and uplift produced the mountains. The collision continues today.

PENINSULAR PLATEAU: Originally part of Gondwanaland (supercontinent). Remained intact when Gondwanaland broke up (~65 million years ago). The Indian Plate (with the plateau on top) drifted northward. The plateau itself is composed of metamorphic and igneous rocks — the basement of the Indian subcontinent.

Step 3 — Rock types.

HIMALAYAS: Mostly SEDIMENTARY rocks (sandstone, shale, limestone) folded and uplifted during the collision. Also some metamorphic rocks (gneiss, schist) at deeper levels.

PENINSULAR PLATEAU: Mostly METAMORPHIC and IGNEOUS rocks (gneiss, granite, basalt). Some sedimentary rocks in the Vindhyans. The Deccan Traps in western India are extensive basalt flows from massive volcanic eruptions ~65 million years ago.

Step 4 — Mineral resources.

HIMALAYAS: Relatively LOW in mineral wealth. Some limestone, gypsum, salt, but not on a major industrial scale.

PENINSULAR PLATEAU: VERY RICH in minerals. Contains ~80% of India's mineral reserves: iron ore (Karnataka, Odisha, Jharkhand), coal (Jharkhand, MP, WB), bauxite, manganese, copper, gold, diamond. This is the foundation of Indian industry.

Step 5 — Current geological activity.

HIMALAYAS: HIGHLY ACTIVE. Earthquakes frequent (Himalayan front is a major seismic zone). Mountains still rising ~5 mm/year. Glacial activity continuing. Landslides common.

PENINSULAR PLATEAU: GEOLOGICALLY STABLE (mostly). No major earthquakes typical. Slow weathering and erosion are the dominant processes. The Deccan Traps' volcanic activity ended ~60 million years ago.

Step 6 — Human use.

HIMALAYAS: Difficult terrain — sparse population, agriculture limited to terraces and valleys. Important for tourism, defence, hydroelectricity, religious pilgrimage.

PENINSULAR PLATEAU: Hosts major industrial cities (Jamshedpur, Bhilai, Rourkela). Major agricultural region for black soil crops (cotton). Important for mining, forestry, hydroelectricity, transportation.

Step 7 — Ecological significance.

HIMALAYAS: Major source of rivers (Indus, Ganga, Brahmaputra). Glaciers feed these rivers. Unique alpine ecosystems. Biodiversity hotspot.

PENINSULAR PLATEAU: Western Ghats are a biodiversity hotspot. Eastern Ghats less so but still significant. Black soil and laterite soils support distinct ecosystems.

Step 8 — Summary table.

| Feature | Himalayas | Peninsular Plateau |
  |---------|-----------|-------------------|
  | Age | 50 million years | 600+ million years |
  | Type | Folded mountains | Ancient plateau |
  | Rocks | Sedimentary | Metamorphic/Igneous |
  | Active? | Yes (rising, earthquakes) | Stable |
  | Minerals | Low | Very rich |
  | Population | Sparse | Heavy (industrial cities) |

✦ Answer: Himalayas are YOUNG (50 mya), formed by plate collision, still rising, low in minerals, high seismic activity. Peninsular Plateau is ANCIENT (600+ mya), formed when Gondwanaland broke up, stable, rich in minerals (80% of India's reserves), hosts most of India's industry. They are geologically opposite — one is birth, the other is geological maturity.

Practice — Physical Features of India

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