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UPPCS Mains
2026 Edition
General Studies Paper I
Smart Notes

Geography

English Medium
10
Chapters
57
Topics
162
Figures & Maps
75
Tables
What's Inside
  1. 01The Earth, Plate Tectonics and Endogenic Phenomena
  2. 02Exogenic Processes and Landforms
  3. 03Atmosphere, Winds and Precipitation
  4. 04Cyclones, the Indian Monsoon and Climate Change
  5. 05Oceanography and Oceanic Resources of India
  6. 06Physiography and Drainage of India
  7. 07Natural Resources: Distribution and Conservation
  8. 08Industries: Location and Distribution
  9. 09Population, Migration and Settlements
  10. 10Frontiers, Boundaries and Refugees
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Geography
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Geography
UPPCS Mains · Smart Notes

Contents

Geography · General Studies Paper I
  1. 01The Earth, Plate Tectonics and Endogenic Phenomena6 topics
    1. 1.1Origin and Interior of the Earth, Rocks and the Rock Cycle
    2. 1.2Continental Drift, Seafloor Spreading and Plate Tectonics
    3. 1.3Endogenic Forces: Folding, Faulting and Mountain Building
    4. 1.4Volcanism and Volcanic Landforms
    5. 1.5Earthquakes and Seismic Zones of India
    6. 1.6Tsunami: Causes, Characteristics and Warning Systems
  2. 02Exogenic Processes and Landforms6 topics
    1. 2.1Weathering, Mass Wasting, Landslides and Avalanches
    2. 2.2Fluvial Landforms
    3. 2.3Glacial Landforms
    4. 2.4Aeolian (Desert) Landforms
    5. 2.5Coastal Landforms
    6. 2.6Karst Landforms
  3. 03Atmosphere, Winds and Precipitation5 topics
    1. 3.1Atmosphere: Composition, Structure and Heat Budget
    2. 3.2Pressure Belts, Planetary and Local Winds
    3. 3.3General Circulation and Jet Streams
    4. 3.4Air Masses and Fronts
    5. 3.5Humidity, Precipitation and Rain Shadow
  4. 04Cyclones, the Indian Monsoon and Climate Change5 topics
    1. 4.1Tropical Cyclones
    2. 4.2Temperate Cyclones, Western Disturbances and Anticyclones
    3. 4.3Indian Monsoon: Mechanism, Onset, Breaks and Withdrawal
    4. 4.4Monsoon Theories, El Niño, La Niña and IOD
    5. 4.5Climate Change and Global Warming
  5. 05Oceanography and Oceanic Resources of India7 topics
    1. 5.1Ocean Floor Relief
    2. 5.2Temperature, Salinity, Density and Thermohaline Circulation
    3. 5.3Ocean Currents
    4. 5.4Ocean Resources and Their Uses
    5. 5.5India's Continental Shelf, EEZ and Seabed Resources
    6. 5.6Coral Reefs and Mangroves
    7. 5.7Ocean Under Stress: SST Rise, Pollution and Over-exploitation
  6. 06Physiography and Drainage of India5 topics
    1. 6.1The Himalayas and Glaciers of India
    2. 6.2Northern Plains and the Thar Desert
    3. 6.3Peninsular Plateau and the Western and Eastern Ghats
    4. 6.4Coastal Plains and Islands of India
    5. 6.5Drainage System of India
  7. 07Natural Resources: Distribution and Conservation7 topics
    1. 7.1Mineral Resources and Mineral Policy
    2. 7.2Energy Resources: Conventional and Renewable
    3. 7.3Water Resources and Water Management
    4. 7.4Soils: Profile, Types and Erosion
    5. 7.5Land Resources, Land Degradation and Desertification
    6. 7.6Natural Vegetation of India
    7. 7.7Forest Resources and Biodiversity Conservation
  8. 08Industries: Location and Distribution5 topics
    1. 8.1Classification and Location Factors of Industries
    2. 8.2Industrial Regions, Corridors and Global Supply Chains
    3. 8.3Iron and Steel Industry
    4. 8.4Agro-Based Industries
    5. 8.5IT, Semiconductor and Other Key Industries
  9. 09Population, Migration and Settlements7 topics
    1. 9.1Population Distribution and Density
    2. 9.2Population Growth, Composition and Human Development
    3. 9.3Migration: Types, Causes and Streams
    4. 9.4Consequences of Migration and Migration Policy
    5. 9.5Rural Settlements: Types, Patterns and Determinants
    6. 9.6Urban Settlements and Urbanisation
    7. 9.7Smart Cities and Smart Villages
  10. 10Frontiers, Boundaries and Refugees4 topics
    1. 10.1Frontiers and Boundaries: Concepts and Types
    2. 10.2India–Pakistan and India–China Boundaries
    3. 10.3India’s Other Land and Maritime Boundaries and Strategic Frontiers
    4. 10.4Refugee Issues: World and India
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GeographyChapter 01 · Topic 1
Chapter 01

The Earth, Plate Tectonics and Endogenic Phenomena

Geography · 6 topics
Topic 1

Origin and Interior of the Earth, Rocks and the Rock Cycle

Chapter Overview

This chapter covers the endogenic side of geomorphology: how the Earth formed, what lies inside it, and how internal heat moves plates, builds mountains and sets off volcanoes, earthquakes and tsunamis. The Myanmar earthquake of 28 March 2025 (M 7.7, about 3,600 dead) showed again how these forces shape hazards in India’s neighbourhood.

Topic 1 explains the origin of the Earth, its layered interior and its rocks. Topics 2 and 3 show how plate movement, folding and faulting build continents and mountains. Topics 4 to 6 cover the sudden events at plate margins (volcanoes, earthquakes and tsunamis), with India’s seismic zones and warning systems.

Topic Flow
  1. 1Origin and Interior of the Earth, Rocks and the Rock Cycle
  2. internal heat drives
  3. 2Continental Drift, Seafloor Spreading and Plate Tectonics
  4. plate pressure causes
  5. 3Endogenic Forces: Folding, Faulting and Mountain Building
  6. faults let magma rise in
  7. 4Volcanism and Volcanic Landforms
  8. plate margins also shake in
  9. 5Earthquakes and Seismic Zones of India
  10. undersea quakes raise
  11. 6Tsunami: Causes, Characteristics and Warning Systems

The Earth formed about 4.6 billion years ago from the solar nebula and later separated into crust, mantle and core. The deepest hole ever drilled, the Kola Superdeep Borehole in Russia (12.26 km, 1989), covers only 0.2% of the 6,371 km to the centre, so most knowledge of the interior is indirect.

Origin of the Earth and Its Spheres

  1. Big Bang: the universe began about 13.8 billion years ago from a single hot, dense state and has been expanding ever since; e.g. red shift of galaxies (Doppler effect), cosmic microwave background radiation, abundance of hydrogen and helium.
  2. Nebular origin: the Sun and planets condensed from a rotating cloud of gas and dust; heavy iron and nickel then sank to form the core; e.g. nebular hypothesis of Kant (1755) and Laplace (1796); the James Webb Space Telescope now images planet-forming discs.
  3. Atmosphere and oceans: gases released by volcanic outgassing formed the early atmosphere, and condensed water vapour filled the ocean basins; e.g. oxygen built up later through photosynthesis (see Ch 3, Topic 1).

Layers of the Interior and Their Boundaries

  1. Sources of evidence: mines, drilling and lava give direct samples of shallow rock, while seismic waves, gravity, magnetism and meteorites reveal deeper layers; e.g. Deep Ocean Drilling Project and Integrated Ocean Drilling Project; change in P and S wave speed at each boundary (see Topic 5).
  2. Internal heat: decay of uranium, thorium and potassium supplies about half the internal heat; the rest is primordial heat from formation; e.g. temperature rises about 1 °C for every 32 m of depth near the surface.
Table 1.1 Density, pressure and temperature all rise with depth; the mean density of the Earth is 5.5 g/cm³, about twice that of crustal rock.
Layer / boundaryDepth (km)State and make-upNote
Continental crust0–35 (up to 70 under mountains)Solid; sial (Si + Al), density 2.7Granitic
Oceanic crust5–10Solid; sima (Si + Mg), density 3.0Basaltic, heavier
Conrad discontinuityWithin continental crustUpper granitic / lower basaltic layerAbsent under oceans
Moho discontinuityAbout 35 (5–10 under oceans)Crust / mantleMohorovičić, 1909
Upper mantleMoho to about 700Asthenosphere (to about 400 km) partly moltenSource of magma; plates glide on it
Repetti discontinuityAbout 700Upper / lower mantleWave speeds rise
Lower mantle700–2,900Solid, rigid silicatesSolid under great pressure
Gutenberg discontinuity2,900Mantle / outer coreS waves stop; P waves slow
Outer core2,900–5,150Liquid iron–nickelGenerates the magnetic field
Lehmann discontinuityAbout 5,150Outer / inner coreInge Lehmann, 1936
Inner core5,150–6,371Solid iron–nickel (NIFE)Solid because of pressure

Geomagnetism and the Magnetosphere

  1. Geodynamo: moving molten iron in the outer core generates a field like a bar magnet tilted about 11° from the axis of rotation; e.g. magnetic north pole moving from Canada towards Siberia, now about 35 km a year after peaking near 50 km (WMM 2025).
  2. Palaeomagnetism: the field reverses at irregular intervals, and each reversal is frozen in cooling lava as a record of past polarity; e.g. last reversal about 7.8 lakh years ago; the weak South Atlantic Anomaly troubles satellites today.
  3. Magnetosphere: the field reaches about ten Earth radii (some 65,000 km) towards the Sun and deflects the charged solar wind; e.g. Van Allen radiation belts; aurora borealis and australis during solar storms, seen even from Hanle, Ladakh, in May 2024.

Rocks and the Rock Cycle

  1. Igneous rocks: cooling magma forms crystalline, fossil-free rocks: coarse intrusive rocks at depth and fine-grained extrusive rocks at the surface; e.g. granite of Bundelkhand; basalt of the Deccan Traps.
  2. Sedimentary rocks: compacted and cemented sediments form layered rocks that hold fossils and cover about three-quarters of the land surface; e.g. Vindhyan sandstone of Dholpur; Gondwana coal of Jharia.
  3. Metamorphic rocks: heat, pressure and chemically active fluids change existing rocks without melting them, often into banded (foliated) forms; e.g. Makrana marble from limestone; gneiss from granite; slate from shale.
  4. Rock cycle: weathering, burial, metamorphism and melting keep turning one rock into another over geological time; e.g. weathered rock also forms soil (see Ch 7, Topic 4).
Table 1.2 Parent rock to metamorphic rock: limestone to marble, sandstone to quartzite, shale to slate, phyllite and schist, granite to gneiss, coal to anthracite.
GroupHow formedExamplesIn India
Igneous: intrusive (plutonic)Slow cooling at depth; coarse crystalsGranite (felsic), diorite, gabbro (mafic)Bundelkhand and Karnataka granite
Igneous: extrusiveFast cooling at surface; fine or glassyBasalt, rhyolite, obsidian, pumiceDeccan Trap basalt
Sedimentary: clasticRock fragments compacted and cementedConglomerate, sandstone, shaleVindhyan sandstone
Sedimentary: chemicalPrecipitated from solutionLimestone, rock salt, gypsumRajasthan gypsum
Sedimentary: organicPlant and animal remainsCoal, chalk, coral limestoneJharia and Raniganj coal
MetamorphicHeat and pressure without meltingMarble, quartzite, slate, phyllite, schist, gneiss, anthraciteMakrana marble, peninsular gneiss
Indian examples of the three rock groups
Fig. 1.1 Indian examples of the three rock groups
The rock cycle: how one rock group turns into another
Fig. 1.2 The rock cycle: how one rock group turns into another

Limits of Our Knowledge of the Interior

The layered model is accepted by all, yet it rests almost wholly on indirect evidence, so the exact depths, state and temperature of the deep layers are still debated.

  1. Inferred boundaries: layer boundaries are inferred from wave behaviour rather than seen, so their depths are averages with wide ranges; e.g. Moho about 5 km deep under oceans but up to 70 km under the Himalaya and Tibet.
  2. Open questions: the heat budget, the structure of the inner core and the causes of field reversals are still under research; e.g. studies of 2023–24 on changes in the inner core’s rotation.

Exploration and Relevance

  1. Resources: knowledge of rock types guides the search for minerals, fuels and building stone across the country; e.g. Makrana marble of the Taj Mahal; Gondwana coal (minerals: see Ch 7, Topic 1).
  2. Hazards and space science: interior studies explain plate motion and hazards, and the same methods now probe other planets and the Moon; e.g. Chandrayaan-3’s seismometer (ILSA) recorded a natural event on the Moon, August 2023.

The layered interior and the rock cycle are the base for understanding plate movement, resources and hazards, so deep-Earth research deserves steady support.

Based on NCERT, Standard Books references, Keywords from Syllabus and Previous Year question Papers

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GeographyChapter 01 · Topic 2
Topic 2

Continental Drift, Seafloor Spreading and Plate Tectonics

The heat of this layered interior keeps the rigid outer shell in motion, an idea that grew from Wegener’s continental drift (1912) into plate tectonics (1967). GPS stations now record the Indian plate moving north-north-east at about 5 cm a year.

Alfred Wegener’s Continental Drift (1912)

  1. Pangaea: all continents once formed one landmass, Pangaea, ringed by the ocean Panthalassa; it began to break up about 200 million years ago; e.g. Laurasia in the north and Gondwanaland in the south, parted by the Tethys Sea.
  2. Evidence: matching coastlines, rock belts, fossils, old glacial deposits and coal on lands now far apart point to a shared past; e.g. fit of Africa and South America; Glossopteris across Gondwana; Mesosaurus in South Africa and Brazil (4,800 km apart); Ghana–Brazil gold belts; tillite; coal in Antarctica.

Seafloor Spreading and Palaeomagnetism

  1. Convection currents: Arthur Holmes suggested in the 1930s that radioactive heat drives slow convection currents in the mantle that can carry the crust; e.g. rising limbs under ridges, sinking limbs under trenches.
  2. Hess hypothesis: magma rising at mid-ocean ridges forms new oceanic crust that moves outward and is destroyed again at trenches; e.g. Harry Hess (early 1960s); the Atlantic widens a few centimetres a year.
  3. Magnetic stripes: bands of normal and reversed magnetism lie in mirror image on both sides of ridges, the strongest proof of spreading; e.g. rocks grow older and sediments thicker away from ridges; no ocean crust is older than about 200 million years.

Plates, Plate Boundaries and Driving Forces

  1. Plate tectonics: the lithosphere is broken into seven major and several minor rigid plates that move over the asthenosphere; e.g. McKenzie and Parker, and Morgan (1967); major: Pacific (largest), Eurasian, African, North American, South American, Indo-Australian, Antarctic; minor: Nazca, Cocos, Arabian, Philippine, Caribbean, Juan de Fuca, Scotia.
  2. Driving forces: mantle convection, ridge push at spreading centres and the slab pull of sinking plates together keep plates moving; e.g. slab pull is now thought to be the strongest of these forces.
  3. Speed of plates: plates move only a few centimetres a year, at rates that differ widely from one boundary to another; e.g. Arctic Ridge under 2.5 cm a year; East Pacific Rise over 15 cm a year.
  4. Evidence today: belts of earthquakes and volcanoes along plate edges, GPS readings and hotspot island chains confirm the theory; e.g. the Hawaii–Emperor chain records the Pacific plate’s motion (see Topic 4).
Table 1.3 Most earthquakes, active volcanoes and young fold mountains lie along these boundaries (ocean-floor relief: see Ch 5, Topic 1).
BoundaryMotion and resultLandformsExample
Divergent (constructive)Plates move apart; new crust formsMid-ocean ridge, rift valleyMid-Atlantic Ridge; East African Rift (lakes Tanganyika, Malawi, Turkana); Red Sea, Gulf of Aden
Convergent: ocean–oceanOlder, denser plate subductsDeep trench, volcanic island arcMariana Trench (about 11 km), Japan, Philippines, Indonesia, Aleutians
Convergent: ocean–continent (Cordilleran)Oceanic plate subducts under the continentTrench, volcanic fold mountainsAndes (Nazca plate); Cascades (Juan de Fuca plate)
Convergent: continent–continentNeither sinks; crust thickens and foldsHigh fold mountains, plateauHimalaya and Tibet; Alps
Transform (conservative)Plates slide past; crust neither made nor lostStrike-slip fault, offset ridgesSan Andreas Fault (1906 quake)
Major plates, boundary types and directions of plate motion
Fig. 1.3 Major plates, boundary types and directions of plate motion

The Indian Plate Moves North

  1. Drift of India: India lay near 50°S about 140 million years ago and, after splitting from Gondwana, moved steadily north towards Asia; e.g. the Tethys Sea lay between India and Asia.
  2. Himalayan collision: India met Eurasia about 40–50 million years ago; neither plate sank, so the crust buckled up into the Himalaya and Tibet; e.g. the Deccan Traps erupted on the way, about 65 million years ago (see Topic 4); for the Himalaya see Ch 6, Topic 1.
Stages in the northward drift of the Indian plate
Fig. 1.4 Stages in the northward drift of the Indian plate

Criticism and Limitations

Each theory corrected the one before it, but debate continues on what finally drives the plates and why some quakes and volcanoes occur far from plate edges.

  1. Wegener’s mechanism: the polar-fleeing force and tidal pull he proposed were far too weak to move continents, so geologists rejected drift for decades; e.g. he also overstated the speed of drift.
  2. Driving force debate: scientists still differ on how much convection, ridge push and slab pull each contribute to plate motion; e.g. hotspots once thought fixed are now known to drift slowly.
  3. Intraplate events: earthquakes and volcanism far from plate edges are not fully explained by the simple boundary model; e.g. the Latur earthquake of 1993 in the stable Deccan (see Topic 5).

Monitoring and Relevance

  1. Hazard mapping: plate boundaries show where earthquakes, volcanoes and tsunamis are likely, which guides zoning and building codes; e.g. the India–Eurasia collision puts the Himalaya in Zones IV–V (see Topic 5).
  2. GPS and resources: GPS networks track strain building up across the Himalaya, and plate settings explain where many minerals form; e.g. polymetallic sulphides on the Carlsberg Ridge, India’s ISA contract of 2025 (see Ch 5, Topic 5).

Plate tectonics joins the Earth’s interior to its mountains, basins and hazards, so plate boundaries should guide India’s hazard planning.

Based on NCERT, Standard Books references, Keywords from Syllabus and Previous Year question Papers

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