Geography & Environment (Comprehensive) for Competitive Exams — Free Notes & Practice
An exhaustive guide covering World Geography, Physical Geography, Indian Geography, and Environmental Ecology for UPSC and top-tier exams.
Relevant for: UPSC CSE, SSC CGL, State PSC, NDA, CDS, RRB NTPC, CAPF.
Free, topic-wise Geography & Environment (Comprehensive) preparation on Siksha Sarovar with 30 topics — theory, formulas, key points and solved examples, available in English and Hindi.
Topics covered (30)
- Universe and the Solar System — Origin of the Universe - Big Bang Theory: Proposed by Georges Lemaître. The universe began as a hot, dense singularity ~13.8 billion years ago. - Galaxies: Vast systems of stars.…
- Earth's Structure & Plate Tectonics — Internal Structure of Earth 1. Crust: Outermost solid part. - Sial: Silica and Aluminium (Continental crust). - Sima: Silica and Magnesium (Oceanic crust). 2. Mantle: Extends to…
- Rocks and Minerals — Types of Rocks 1. Igneous Rocks: Formed from cooling of lava/magma. - Intrusive: Cool inside (e.g., Granite). - Extrusive: Cool on surface (e.g., Basalt). - Features: Crystalline,…
- Geomorphology: Earth's Forces — Endogenic Forces (Internal) Originate from inside the Earth. - Diastrophism: Sudden (Earthquakes, Volcanic eruptions) or Slow (Mountain building - Orogenic). - Volcanism: -…
- Climatology: Atmosphere & Pressure — Composition of Atmosphere - Nitrogen (78%) , Oxygen (21%) , Argon (0.93%), CO2 (0.04%). Layers of Atmosphere 1. Troposphere: Up to 13-18 km. All weather phenomena occur here.…
- Climatology: Winds and Humidity — Planetary Winds - Trade Winds: Blow from Sub-tropical High to Equatorial Low. - Westerlies: Blow from Sub-tropical High to Sub-polar Low. - Polar Easterlies: Blow from Polar High…
- Climatology: Cyclones and Air Masses — Air Masses A large body of air having uniform temperature and humidity. (e.g., Continental Polar, Maritime Tropical). Fronts The boundary between two different air masses. (Cold…
- Oceanography: Basins, Tides & Salinity — Ocean Relief 1. Continental Shelf: Shallowest part, rich in fish and oil. 2. Continental Slope: Steeper descent. 3. Abyssal Plains: Deep, flat floor. 4. Oceanic Trenches: Deepest…
- Oceanography: Currents & Coral Reefs — Ocean Currents Large-scale movement of water. - Warm Currents: Flow from Equator to Poles. (Gulf Stream - Atlantic; Kuroshio - Pacific). - Cold Currents: Flow from Poles to…
- World Geography: Continents & Features — 1. Asia - Largest continent. Highest point: Mt. Everest. Lowest: Dead Sea. - Longest river: Yangtze (China). Largest lake: Caspian Sea. - Deepest lake: Baikal (Russia). 2. Africa…
- Indian Geography: The Himalayas — Origin of Himalayas - Young fold mountains formed by the collision of the Indo-Australian Plate and Eurasian Plate . - Uplifted from the Tethys Sea . Three Parallel Ranges 1.…
- Indian Geography: Plains and Plateau — 1. The Great Northern Plains - Formed by the deposition of silt by Indus, Ganga, and Brahmaputra. - Bhabar: Porous region where streams disappear. - Terai: Marshy, wet forest…
- Indian Geography: The Ganga River System — Origin - Formed by the meeting of Alaknanda and Bhagirathi at Devprayag . - Sources: Gangotri Glacier (Bhagirathi) and Satopanth Glacier (Alaknanda). Major Tributaries - Left…
- Indian Geography: Indus and Brahmaputra — 1. Indus River System - Origin: Near Mansarovar Lake (Tibet). - Length: ~2880 km (~710 km in India). - Tributaries: Jhelum, Chenab (largest), Ravi, Beas, Sutlej. - Indus Water…
- Indian Geography: Peninsular Rivers — East-Flowing Rivers (Drain into Bay of Bengal) Form large deltas. 1. Mahanadi: Originates in Chhattisgarh. Hirakud Dam is on it. 2. Godavari: Largest peninsular river. Known as…
- Indian Geography: Monsoon & Climate — Mechanism of Monsoon The Indian climate is dominated by the Monsoon (seasonal reversal of winds). - Summer (South-West Monsoon): - Onflow: Thermal contrast between land and sea.…
- Indian Geography: Soil and Natural Vegetation — Major Soil Types (ICAR classification) 1. Alluvial Soil (40%): Most widespread and fertile. Formed by river deposition. 2. Black Soil (Regur): Formed from basaltic lava. Best for…
- Indian Geography: Agriculture & Livestock — Cropping Seasons - Kharif: June-Oct (Rice, Maize, Cotton, Jute, Bajra). - Rabi: Nov-April (Wheat, Mustard, Gram, Barley, Peas). - Zaid: May-June (Watermelon, Cucumber, Fodder).…
- Indian Geography: Mineral Resources — Classification - Metallic (Ferrous): Iron Ore, Manganese. - Metallic (Non-ferrous): Copper, Bauxite. - Non-metallic: Mica, Limestone. - Energy Minerals: Coal, Petroleum, Uranium.…
- Indian Geography: Industries & Regions — Major Industries 1. Iron and Steel: - TISCO (Jamshedpur) - Private. - Public Sector (SAIL): Bhilai (with USSR help), Rourkela (Germany), Durgapur (UK), Bokaro (USSR). 2. Cotton…
- Indian Geography: Transport and Ports — 1. Roadways - NH 44: Longest (Srinagar to Kanyakumari). - Golden Quadrilateral: Connects Delhi-Mumbai-Chennai-Kolkata. 2. Railways - Divided into 18 zones . (Headquarters: e.g.,…
- Indian Geography: Demography (Census 2011) — Census 2011 Data (Still used for exams until new data released) - Total Population: 1.21 Billion. - Density: 382 per sq km. (Highest: Bihar; Lowest: Arunachal Pradesh). - Sex…
- Environment: Ecosystem and Biodiversity — Ecosystem The interaction between living (biotic) and non-living (abiotic) components. - Trophic Levels: Producers → Primary Consumers → Secondary Consumers → Decomposers. - 10%…
- Environment: Climate Change & Pollution — Greenhouse Effect Trapping of heat by gases: CO2, CH4 (Methane), N2O, CFCs, Water Vapor. - Leads to Global Warming and melting of polar ice. Ozone Depletion - Occurs in…
- Environment: Conservation in India — Protected Areas - National Parks: High protection, no human activity allowed. (e.g., Jim Corbett - 1st). - Wildlife Sanctuaries: Some human activity (like grazing) allowed. -…
- Natural Hazards & Disaster Management — Common Hazards in India 1. Floods: Frequent in Plains (Ganga, Brahmaputra). 2. Droughts: Arid and semi-arid regions (Rajasthan, Rayalaseema). 3. Cyclones: Mainly on the Eastern…
- Geography Mapping: Passes, Straits & Canals — Important Indian Passes - Zoji La: Connects Srinagar to Leh. - Shipki La: Connects HP to Tibet (Sutlej river enters here). - Nathu La: Sikkim to Tibet (Silk route branch). -…
- Air Masses, Fronts and Jet Streams — Air Masses A massive volume of air characterized by uniform temperature and moisture content. They form over source regions (Oceans/Continents). - cP (Continental Polar) - Cold…
- Economic Geography: Global Resources — Major Producing Regions - Wheat: Steppes (Russia/Ukraine), Prairies (USA/Canada), Punjab (India). - Coffee: Brazil (largest), Ethiopia, Vietnam. - Iron Ore: Australia, Brazil,…
- Islands and Coral Reefs (World) — Types of Islands 1. Continental: Parts of a continent (e.g., Sri Lanka, Madagascar). 2. Volcanic: Formed by volcanic eruption (e.g., Hawaii, Mauritius). 3. Coral: Built by corals…
Universe and the Solar System
Origin of the Universe
- Big Bang Theory: Proposed by Georges Lemaître. The universe began as a hot, dense singularity ~13.8 billion years ago.
- Galaxies: Vast systems of stars. Our galaxy is the Milky Way (spiral-shaped). Andromeda is the nearest spiral galaxy.
The Solar System
- Sun: The center. Energy source: Nuclear fusion (Hydrogen → Helium). Surface temp: ~6000°C.
- Inner Planets (Terrestrial): Mercury, Venus, Earth, Mars. Rocky, high density.
- Outer Planets (Jovian/Gas Giants): Jupiter, Saturn, Uranus, Neptune. Gaseous, low density, ring systems.
- Venus: Hottest planet (95% CO2), "Morning/Evening Star", "Earth's Twin", rotates clockwise.
- Mars: "Red Planet" due to iron oxide. Has two moons: Phobos and Deimos.
- Jupiter: Largest planet. Famous for the "Great Red Spot".
- Saturn: Second largest, known for spectacular rings. Titan is its largest moon.
- Neptune: Coldest and windiest planet.
Other Celestial Bodies
- Asteroids: Found in the belt between Mars and Jupiter.
- Comets: "Dirty snowballs" with long elliptical orbits.
- Meteoroids: Fragments of rocks. Become "Meteors" (shooting stars) when they enter atmosphere.
Key points
- Light Year is a unit of distance (distance light travels in a year).
- Sunlight takes 8 minutes and 20 seconds to reach Earth.
- Mercury has the shortest year (88 days).
- Pluto was reclassified as a "Dwarf Planet" in 2006.
Frequently asked questions
Is this Geography & Environment (Comprehensive) material free?
Yes — all Geography & Environment (Comprehensive) notes and practice on Siksha Sarovar are completely free.
Is the content available in Hindi?
Yes. Lessons are bilingual (English and Hindi) so you can study in whichever language you are comfortable with.
Which exams does this help with?
It is aligned to UPSC CSE, SSC CGL, State PSC, NDA, CDS, RRB NTPC, CAPF and similar government exams.