NCERT Geography Summaries | UPSC

Strategy: For UPSC, Class 11–12 Geography NCERTs are most important. Focus on Physical Geography fundamentals + Indian Geography (Class 11) and Human + India People & Economy (Class 12). Class 6–10 provide basics — skim if short on time.

Class 11 — Fundamentals of Physical Geography

Chapter 1–2: Earth — Origin, Interior, Landforms

Earth's Interior

Earth layers: Crust (outermost) → Mantle → Outer Core (liquid iron-nickel) → Inner Core (solid) PYQ
Crust: Continental crust (35 km thick, granite — SIAL) + Oceanic crust (5–10 km, basalt — SIMA)
Plate Tectonics: Lithosphere divided into ~12 major plates floating on asthenosphere
Plate boundaries: Convergent (collision — mountains formed), Divergent (separation — mid-ocean ridges), Transform (sliding — earthquakes)
Himalayan formation: Indian plate (part of Gondwana) moved north and collided with Eurasian plate ~50 million years ago → Himalayas pushed up
Earthquakes: Occur at plate boundaries; measured by Richter scale (magnitude) and Mercalli scale (intensity)
Volcanoes: At convergent/divergent boundaries; Ring of Fire (Pacific Ocean) most active zone PYQ

Key Fact: India's Deccan Plateau was formed by volcanic activity (~65 million years ago — same time as dinosaur extinction). Deccan Traps = basaltic lava flows.

Chapter 3–4: Landforms & Their Evolution

Weathering & Erosion Agents

Agent	Landforms Created	Example in India
River (fluvial)	V-valley, meanders, delta, floodplain, alluvial fan	Ganga delta, Brahmaputra meanders
Glacier	U-valley, cirque, horn, moraine, fjord	Kashmir valleys, Himalayan glaciers
Wind (aeolian)	Barchan dune, yardang, loess	Thar Desert
Waves (marine)	Sea caves, arches, cliffs, beaches, spits	Western Ghats coast
Groundwater (karst)	Sinkholes, stalactites, stalagmites, caves	Meghalaya caves

Meander: River curves on flat plain; oxbow lake = cut-off meander
Delta: Deposition at river mouth where velocity slows — Ganga-Brahmaputra delta (Sundarbans)
Alluvial Fan: Where fast mountain stream enters flat plain — North Indian plain formation

Chapter 8–12: Atmosphere, Climate, Ocean

Most Important for UPSC

Atmosphere Layers

Troposphere (0–12 km): Weather occurs here; temperature falls with height (6.5°C/km lapse rate)
Stratosphere (12–50 km): Contains ozone layer (protects from UV); temperature rises with height
Mesosphere (50–80 km): Coldest layer; meteors burn here
Thermosphere/Ionosphere (80+ km): Very hot; auroras occur; radio waves reflect

Pressure Belts & Winds PYQ

Equatorial Low Pressure (0°): Hot air rises → convergence → rainfall (ITCZ)
Subtropical High Pressure (30°N/S): Descending air → deserts (Sahara, Thar, Arabian)
Sub-polar Low Pressure (60°N/S): Convergence of cold + warm air → cyclones
Polar High Pressure (90°N/S): Very cold descending air
Planetary winds: Trade winds (30°→0°), Westerlies (30°→60°), Polar Easterlies (90°→60°)
Jet Streams: Fast-moving air in upper atmosphere (~9–12 km); subtropical and polar jet streams control weather PYQ

Monsoon

Indian Monsoon: Seasonal reversal of winds — SW monsoon (June–Sep) brings 75%+ of India's rainfall
Mechanism: Differential heating of land vs ocean; ITCZ shifts northward; Arabian Sea + Bay of Bengal branches
El Niño: Warming of central/eastern Pacific → weakens Indian monsoon → drought PYQ
La Niña: Cooling of Pacific → stronger monsoon → floods
ENSO: El Niño Southern Oscillation — periodic climate phenomenon affecting global weather
Mango showers: Pre-monsoon showers in Kerala/Karnataka (Apr–May)
Retreating Monsoon: Oct–Dec over southeast India (Tamil Nadu gets rain during this)

Ocean Currents

Current	Ocean	Nature	Effect
Gulf Stream	North Atlantic	Warm	Keeps Western Europe mild PYQ
Labrador Current	North Atlantic	Cold	Grand Banks fog, rich fisheries
Kuroshio	North Pacific	Warm	Mild climate in Japan
Benguela	South Atlantic	Cold	Namib Desert, upwelling, fish
Indian Ocean Gyre	Indian Ocean	Seasonal	Reverses with monsoon — unique

Chapter 13: Water (Hydrological Cycle)

Hydrological cycle: Evaporation → condensation → precipitation → runoff → evaporation
Groundwater: Water stored in aquifers; replenished by rain; India's largest water source
Aquifer types: Confined (artesian, under pressure) vs Unconfined (water table)
India's water bodies: Rivers + groundwater provide 90%+ of water needs
Ocean Salinity: Average 35 ppm; Atlantic saltiest, Arctic least salty; affects density and ocean currents
Tides: Caused by gravitational pull of Moon (mainly) and Sun; spring tides (full/new moon) highest; neap tides (quarter moon) lowest

Chapter 14–16: Biosphere, Ecosystems, Natural Hazards

World Biomes PYQ

Biome	Climate	Key Features	Location
Tropical Rainforest	Hot, wet year-round	Highest biodiversity, dense canopy	Amazon, Congo, SEA
Savanna	Hot, seasonal rain	Grassland with scattered trees	East Africa, Deccan
Desert	Arid, extreme temps	Succulents, nocturnal animals	Sahara, Thar, Gobi
Mediterranean	Hot dry summer, mild wet winter	Shrubs, olive, cork oak	S. Europe, California
Temperate Grassland	Moderate, dry	Prairies, steppes, pampas	North America, Russia
Taiga (Boreal Forest)	Cold, moderate rain	Conifer forests	Canada, Siberia
Tundra	Very cold, low rain	Permafrost, mosses, lichens	Arctic, high mountains

Class 11 — India: Physical Environment

Chapter 2: Structure & Physiography

Physical Divisions of India

Division	Key Features	States
Himalayan Mountains	Young fold mountains; 3 parallel ranges; earthquake prone	J&K, HP, UK, Sikkim, NE
Northern Plains	Formed by Ganga-Brahmaputra-Indus alluvium; most fertile; bhabar, terai, khadar, bhangar	Punjab to Assam
Peninsular Plateau	Ancient, stable; Deccan Trap basalt; highest biodiversity	Maharashtra to TN, Odisha
Coastal Plains	Eastern (wider delta, lagoons) vs Western (narrower, estuaries)	All coastal states
Islands	Andaman & Nicobar (Bay of Bengal, volcanic); Lakshadweep (Arabian Sea, coral)	UT
Thar Desert	Oldest desert; sand dunes (erg), rocky (reg); Aravalli on east	Rajasthan, Gujarat

Himalayan Ranges PYQ

Greater Himalayas (Himadri): Highest; perennial snow; avg height 6,000m; Mt. Everest (8,849m — Nepal)
Middle Himalayas (Himachal): 3,700–4,500m; Shimla, Mussoorie, Nainital; Pir Panjal, Mahabharat ranges
Outer Himalayas (Shivalik): Lowest; 900–1,100m; duars/doons (valleys) between Shivalik and Himachal
Notable peaks in India: Kangchenjunga (8,586m — Sikkim, highest in India), K2 (8,611m — PoK)

Northern Plains Zones

Bhabar: Narrow zone at Himalayan foothills; stones & pebbles; rivers sink underground
Terai: Below bhabar; marshy, forested; rivers reappear; rich biodiversity
Bhangar: Old alluvium above flood level; older settled area
Khadar: New alluvium in floodplains; renewed by floods; most fertile

Chapter 3–5: Drainage, Climate, Natural Vegetation

Indian Rivers — Two Systems

Feature	Himalayan Rivers	Peninsular Rivers
Source	Glaciers (perennial)	Plateau (seasonal)
Flow	Antecedent (older than mountains)	Consequent (follow slopes)
Valleys	Deep gorges	Shallow, wide
Delta	Large, fertile	Smaller (except Godavari)
Examples	Ganga, Brahmaputra, Indus	Godavari, Krishna, Cauvery, Mahanadi

Key Rivers Quick Facts PYQ

Ganga: 2,525 km; source Gangotri; tributaries — Yamuna, Ghaghra, Gomti, Son, Chambal
Brahmaputra: Longest river in India (within India: 916 km); originates in Tibet (Tsangpo); Majuli island (largest river island)
Indus: Originates Tibet (Mansarovar); flows through J&K; mostly in Pakistan; tributaries — Jhelum, Chenab, Ravi, Beas, Sutlej
Godavari: Longest peninsular river (1,465 km); "Ganga of South"; originates Trimbakeshwar (Maharashtra)
Cauvery: Originates Brahmagiri (Karnataka); disputes between Karnataka-TN PYQ

Climate Zones of India

India has varied climates due to its size and geography
Tropical Monsoon: Most of India — distinct wet/dry seasons
Tropical Wet: Kerala, Coastal Karnataka — rain almost year-round
Semi-arid/Arid: Rajasthan, parts of Gujarat, Deccan interior
Alpine/Tundra: High Himalayas (Ladakh, high peaks)
Temperate: Kashmir valley, Himachal Pradesh

Natural Vegetation IMP

Type	Rainfall	Key Trees	Location
Tropical Wet Evergreen	>200 cm	Rosewood, ebony, mahogany	Western Ghats, NE India
Tropical Deciduous	100–200 cm	Teak, sal, bamboo, sandalwood	Central India, Eastern Ghats
Tropical Dry Deciduous	70–100 cm	Babool, palas, khair	Deccan, UP, Bihar drier areas
Thorn & Scrub	<50 cm	Cactus, acacia, date palm	Rajasthan, Kutch
Montane Temperate	Variable	Oak, rhododendron, pine, deodar	Himalayas 1,500–3,000m
Mangroves	Coastal	Sundari (gives name Sundarbans)	Ganga-Brahmaputra delta, Andamans

Chapter 6–7: Soils & Natural Hazards

Indian Soils PYQ

Soil Type	Colour	Crop	Location
Alluvial	Light grey to brown	Wheat, rice, sugarcane	North Indian Plains, river valleys
Black (Regur)	Black (high clay)	Cotton (ideal!), wheat, jowar	Maharashtra, MP, Gujarat
Red & Yellow	Red (iron oxidation)	Groundnut, millets, tobacco	Eastern plateau, Eastern Ghats
Laterite	Red (leached)	Tea, coffee, cashew	Western Ghats, NE, Odisha
Arid/Desert	Sandy, saline	Drought resistant crops	Rajasthan, W. Gujarat
Forest/Mountain	Variable	Temperate fruits, potato	Himalayan states
Peaty/Marshy	Dark (organic)	Rice	Kerala, Sundarbans, Bihar

UPSC Tip: Black soil = best for cotton because it retains moisture. Laterite = highly leached, poor in nutrients. Alluvial = most widespread and fertile.

Class 12 — Fundamentals of Human Geography

Chapter 1–3: Human Geography, Population, Migration

World Population Distribution PYQ

World population: ~8.1 billion (2024)
High density areas: East Asia (China, Japan, Korea), South Asia (India, Bangladesh), Western Europe
Low density: Sahara, Amazon, Arctic, Australian interior, Central Asia deserts
Factors: Temperature, rainfall, soil fertility, mineral resources, industrial development
Demographic Transition: Stage 1 (High BR, High DR — pre-industrial), Stage 2 (High BR, Low DR — growing fast), Stage 3 (Falling BR, Low DR — slowing), Stage 4 (Low BR, Low DR — stable)
India in Stage 2→3 transition; most developed countries in Stage 4

Migration

Push factors: Poverty, drought, unemployment, conflict, disasters
Pull factors: Employment, better wages, education, peace, social freedom
International migration: Labour migration to Gulf, Europe; refugee flows from conflict zones
India's internal migration: Rural to urban (Maharashtra, Delhi, Gujarat attract most migrants)

Chapter 6–8: Secondary, Tertiary Activities & Transport

Industries

Footloose industries: Not tied to raw materials/market — electronics, IT — can locate anywhere
High-tech industries: Silicon Valley, Bangalore (IT corridor)
Industrial regions of world: NE USA, Western Europe (Rhine Valley), Russia (Ural), Japan (Pacific Coast), China (Pearl River Delta)

Trade & Transport

Containerisation: Revolutionised sea trade — standard containers, mechanised ports
Major ports: Singapore (busiest), Shanghai, Rotterdam (Europe), Jawaharlal Nehru Port (India)
Trans-Siberian Railway: Longest railway (9,289 km) from Moscow to Vladivostok PYQ
Trade blocs: ASEAN, EU, NAFTA/USMCA, MERCOSUR, SAARC
Choke points: Strait of Hormuz (oil), Strait of Malacca (trade), Suez Canal, Panama Canal

Class 12 — India: People and Economy

Chapter 1–3: Population, Migration, Human Development

India's Population PYQ

India: 1.44 billion (2024) — World's most populous country (surpassed China in 2023)
Census 2011: 1.21 billion; density 382/sq km; literacy 74.04%
Most populous state: Uttar Pradesh; Least: Sikkim
Highest density: Bihar (1,106/sq km); Lowest: Arunachal Pradesh (17/sq km)
Sex ratio: 943 females per 1000 males (2011); Kerala highest (1,084); Haryana lowest (879)
Demographic Dividend: India has large working-age population — opportunity if educated and employed

India Human Development Index

HDI = Health (life expectancy) + Education (mean and expected years) + Income (GNI per capita)
Kerala top state on most HDI indicators
India's global HDI rank: ~134 (2023) — Medium HDI category
Gender Development Index: Kerala best; Bihar worst

Chapter 5–7: Land Use, Water Resources, Mineral Resources

India's Land Use

Total area: 328.7 million hectares; Cultivated: ~141 million ha; Forest: ~71 million ha
Net Sown Area: Area actually cultivated; declining due to urbanisation
Fallow Land: Land left uncultivated temporarily to regain fertility

Water Resources PYQ

India has 4% of world's freshwater but 18% of population → water stressed
Rainwater harvesting: Traditional methods — johad (Rajasthan), baoli (stepwells), kundi (TN), ahar-pyne (Bihar)
River Linking Project: National Perspective Plan to link surplus rivers to deficit rivers — controversial
Interlinking rivers: Ken-Betwa (first) approved; concerns: ecology, displacement

Minerals PYQ

Mineral	Leading States	Significance
Iron Ore	Odisha, Chhattisgarh, Jharkhand, Karnataka	Steel industry
Coal	Jharkhand, Odisha, Chhattisgarh, WB	Power, steel
Bauxite (Aluminium)	Odisha, Andhra Pradesh, Jharkhand	Aluminium industry
Copper	Rajasthan, Jharkhand, MP	Electrical wires
Manganese	Odisha, Karnataka, Madhya Pradesh	Steel alloy
Mica	Jharkhand, Rajasthan, AP	Electrical insulation
Limestone	MP, Rajasthan, AP, Gujarat	Cement industry
Gold	Karnataka (Kolar, Hutti)	Jewellery, reserves

Chapter 8–10: Industries, Transport, International Trade

Major Industries of India

Industry	Key Centres	Issues
Cotton Textiles	Mumbai, Ahmedabad, Coimbatore, Kanpur	Power shortages, competition from China
Jute	Hooghly river belt (WB)	Bangladesh competition; synthetic substitutes
Iron & Steel	Jamshedpur (TISCO), Bhilai (SAIL), Rourkela, Durgapur, Bokaro	Raw material location-based PYQ
Petroleum Refining	Mumbai, Jamnagar (largest), Koyali, Mathura, Chennai	Import dependent
IT/Software	Bangalore, Hyderabad, Chennai, Pune, NOIDA	Global competition
Automobile	Chennai, Gurgaon, Pune, Mumbai	Shifting to EVs

Transport Network

National Highways: 1.46 lakh km; NH44 longest (Srinagar to Kanyakumari, 3,806 km)
Railways: 68,000+ km route; Indian Railways 4th largest network
Golden Quadrilateral: Delhi–Mumbai–Chennai–Kolkata highway — 5,846 km
North-South & East-West Corridor: Srinagar to Kanyakumari + Silchar to Porbandar
Major Ports: Mumbai (busiest), JNPT (container), Chennai, Vishakhapatnam, Kolkata-Haldia

Class 6–10: Foundation Geography (Key Points)

Class 6 — The Earth: Our Habitat

Earth is the only planet with life; 3rd from Sun; one natural satellite (Moon)
Latitudes: Equator (0°), Tropics (23.5°N/S), Arctic/Antarctic circles (66.5°N/S), Poles (90°N/S)
Longitudes: Prime Meridian (0°) through Greenwich; 180° International Date Line
India: 8°4'N to 37°6'N latitude; 68°7'E to 97°25'E longitude
IST: GMT + 5:30 hrs; based on 82.5°E (passing through Mirzapur, UP)
Domains of Earth: Lithosphere (land), Hydrosphere (water), Atmosphere (air), Biosphere (life)

Class 9 — Contemporary India I

India's area: 3.287 million sq km — 7th largest country; 2.4% of world area
India's neighbours: Pakistan, Afghanistan, China, Nepal, Bhutan, Bangladesh, Myanmar (land); Sri Lanka, Maldives (sea)
Tropic of Cancer (23.5°N): Passes through Gujarat, Rajasthan, MP, Chhattisgarh, Jharkhand, WB, Tripura, Mizoram (8 states) PYQ
Standard Meridian 82.5°E: Passes through UP (Mirzapur), MP, Chhattisgarh, Odisha, AP
Deccan Plateau: Triangular; bounded by Western Ghats, Eastern Ghats, Vindhyas-Satpuras

Class 10 — Contemporary India II

Forest & Wildlife

India's forest cover: ~21.7% (2021 FSI report) — target is 33% under National Forest Policy
Project Tiger (1973): 53 tiger reserves; India has ~75% of world's tigers PYQ
Project Elephant (1992): 29 elephant reserves
Biodiversity hotspots in India: Western Ghats + Sri Lanka, Himalaya, Indo-Burma, Sundaland (Andamans)

Agriculture

Kharif crops: Sown June-July, harvested Oct — Rice, cotton, jowar, bajra, groundnut
Rabi crops: Sown Oct-Nov, harvested March — Wheat, barley, gram, mustard PYQ
Zaid crops: Summer crops — watermelon, cucumber, muskmelon
Green Revolution (1960s): HYV seeds, irrigation, fertilisers → wheat and rice revolution (Punjab, Haryana, UP)

NCERT Geography — Complete Summaries