Geography Notes for SSC, Railway & Competitive Exams
Geography is one of the most important subjects in General Knowledge and General Science for SSC, Railway, Banking, Defence, Police and State Government examinations. These notes explain important geographical concepts in simple English with easy-to-understand tables, facts and revision points.
Introduction to Geography
Geography is the study of the Earth, its physical features, climate, natural resources, environment and human activities. It helps us understand the relationship between people and their surroundings.
Geography is an important subject for competitive examinations because questions are frequently asked about the Earth, latitude and longitude, climate, rivers, mountains, oceans and natural phenomena.
- Earth
- Latitudes & Longitudes
- Motions of the Earth
- Time Zones
- Rocks
- Climate
- Rivers & Oceans
- Mountains
The Earth
The Earth is the third planet from the Sun and the only known planet that supports life. About 71% of the Earth’s surface is covered by water, while about 29% is covered by land.
| Feature | Information |
|---|---|
| Position from the Sun | Third Planet |
| Natural Satellite | Moon |
| Water Surface | 71% |
| Land Surface | 29% |
| Shape | Oblate Spheroid (Geoid) |
- The Earth is called the “Blue Planet”.
- The Earth rotates from west to east.
- The Earth is slightly flattened at the poles and bulged at the equator.
Quick Revision
- 3rd Planet → Earth
- Blue Planet → Earth
- Natural Satellite → Moon
- Water → 71%
Shape and Size of the Earth
The Earth is not a perfect sphere. It is slightly flattened at the poles and bulged at the equator. This shape is known as an Oblate Spheroid or Geoid.
| Property | Value |
|---|---|
| Equatorial Diameter | ≈ 12,756 km |
| Polar Diameter | ≈ 12,714 km |
| Mean Radius | ≈ 6,371 km |
| Circumference | ≈ 40,075 km |
- The equatorial diameter is slightly greater than the polar diameter.
- The Earth’s circumference is about 40,075 km.
- The Earth is widest at the equator.
Quick Revision
- Shape → Geoid
- Radius → 6,371 km
- Circumference → 40,075 km
Motions of the Earth
The Earth has two important motions: Rotation and Revolution. These movements are responsible for day and night, seasons and changes in climate.
| Motion | Description |
|---|---|
| Rotation | Earth rotates on its axis in about 24 hours. |
| Revolution | Earth revolves around the Sun in about 365¼ days. |
📘 Remember
Rotation → Day & NightRevolution → Seasons
- The Earth rotates from west to east.
- Leap Year occurs every four years because of the extra one-fourth day.
- The Earth’s axis is tilted at approximately 23½°.
Quick Revision
- Rotation → 24 Hours
- Revolution → 365¼ Days
- Axis Tilt → 23½°
Latitudes and Longitudes
Latitudes and longitudes form a geographical coordinate system used to locate any place on the Earth’s surface.
| Latitude | Longitude |
|---|---|
| Imaginary circles running east-west. | Imaginary lines running north-south. |
| Measure distance north or south of the Equator. | Measure distance east or west of the Prime Meridian. |
| 0° Latitude → Equator | 0° Longitude → Prime Meridian |
Quick Revision
- 0° Latitude → Equator
- 0° Longitude → Prime Meridian
- Latitudes → Parallel Circles
- Longitudes → Meet at Poles
Important Parallels of Latitude
| Latitude | Name |
|---|---|
| 0° | Equator |
| 23½° North | Tropic of Cancer |
| 23½° South | Tropic of Capricorn |
| 66½° North | Arctic Circle |
| 66½° South | Antarctic Circle |
| 90° North | North Pole |
| 90° South | South Pole |
23½° → Tropics
66½° → Polar Circles
Quick Revision
- Equator → 0°
- Tropic of Cancer → 23½° N
- Tropic of Capricorn → 23½° S
- Arctic Circle → 66½° N
- Antarctic Circle → 66½° S
Time Zones
Different parts of the Earth experience different local times because the Earth rotates on its axis. To maintain uniform time, the world is divided into 24 time zones.
| Feature | Information |
|---|---|
| Total Time Zones | 24 |
| Prime Meridian | 0° Longitude |
| Indian Standard Time (IST) | 82½° East Longitude |
| Greenwich Mean Time | GMT (0° Longitude) |
- Each time zone covers approximately 15° of longitude.
- IST is 5 hours 30 minutes ahead of GMT.
- The Standard Meridian of India passes near Mirzapur in Uttar Pradesh.
📘 Remember
360° ÷ 24 Hours = 15° per HourQuick Revision
- Time Zones → 24
- IST → 82½° E
- GMT → 0°
- 1 Hour → 15° Longitude
Interior of the Earth
The Earth is made up of three main layers: the Crust, Mantle and Core. Each layer has different physical and chemical properties.
- Layers of the Earth
- Crust, Mantle & Core
- Composition of the Earth
| Layer | Main Features |
|---|---|
| Crust | Outermost and thinnest layer where we live. |
| Mantle | Middle layer composed mainly of silicate rocks. |
| Core | Innermost layer mainly composed of iron and nickel. |
- The crust is the thinnest layer of the Earth.
- The mantle is the thickest layer.
- The core is the hottest part of the Earth.
- The inner core is solid, while the outer core is liquid.
Quick Revision
- Outermost Layer → Crust
- Thickest Layer → Mantle
- Hottest Layer → Core
Rocks
A rock is a naturally occurring solid mass made up of one or more minerals. Rocks form the Earth’s crust and are classified into three main types.
| Rock Type | Formation | Example |
|---|---|---|
| Igneous | Cooling and solidification of magma. | Granite, Basalt |
| Sedimentary | Deposition and compaction of sediments. | Sandstone, Limestone |
| Metamorphic | Transformation of existing rocks due to heat and pressure. | Marble, Slate |
- Igneous rocks are called the “Primary Rocks”.
- Sedimentary rocks often contain fossils.
- Marble is a metamorphic rock formed from limestone.
Quick Revision
- Granite → Igneous
- Limestone → Sedimentary
- Marble → Metamorphic
Earthquakes
An earthquake is the sudden shaking of the Earth’s surface caused by the release of energy inside the Earth’s crust. Most earthquakes occur due to the movement of tectonic plates.
| Term | Description |
|---|---|
| Focus (Hypocentre) | Point inside the Earth where the earthquake originates. |
| Epicentre | Point on the Earth’s surface directly above the focus. |
| Instrument | Seismograph |
| Scale | Moment Magnitude Scale (Earlier: Richter Scale) |
- Earthquakes are commonly associated with tectonic plate boundaries.
- The epicentre experiences the strongest shaking at the surface.
- Seismic waves spread outward from the focus.
Quick Revision
- Instrument → Seismograph
- Inside Earth → Focus
- Surface Point → Epicentre
Volcanoes
A volcano is an opening in the Earth’s crust through which molten rock (magma), gases and ash escape to the surface.
| Type | Description |
|---|---|
| Active | Currently erupting or likely to erupt. |
| Dormant | Inactive for a long time but may erupt again. |
| Extinct | Not expected to erupt again. |
- Magma is called lava after it reaches the Earth’s surface.
- Most active volcanoes are located around the Pacific Ring of Fire.
Quick Revision
- Molten Rock Inside Earth → Magma
- Molten Rock Outside Earth → Lava
- Most Volcanoes → Pacific Ring of Fire
Mountains
Mountains are large natural elevations of the Earth’s surface. They influence climate, rainfall and river systems.
| Mountain Type | Example |
|---|---|
| Fold Mountains | Himalayas, Alps |
| Block Mountains | Black Forest (Germany) |
| Volcanic Mountains | Mount Fuji (Japan) |
| Residual Mountains | Aravalli Range (India) |
- The Himalayas are the world’s highest fold mountains.
- Mount Everest is the highest peak above sea level.
- The Aravalli Range is one of the oldest mountain ranges in the world.
Quick Revision
- Highest Fold Mountains → Himalayas
- Highest Peak → Mount Everest
- Oldest Mountains (India) → Aravalli
Plateaus
A plateau is a broad, elevated area of flat land that rises sharply above the surrounding region. Plateaus are often rich in minerals.
| Plateau | Location |
|---|---|
| Deccan Plateau | India |
| Tibetan Plateau | Asia |
| Colorado Plateau | USA |
- The Tibetan Plateau is known as the “Roof of the World”.
- The Deccan Plateau is the largest plateau in India.
- Plateaus are rich in mineral resources.
Quick Revision
- Roof of the World → Tibetan Plateau
- Largest Plateau (India) → Deccan Plateau
Plains
Plains are broad, flat or gently sloping areas of land. They are highly suitable for agriculture, transportation and human settlements.
| Type | Example |
|---|---|
| Alluvial Plains | Indo-Gangetic Plain |
| Coastal Plains | Eastern & Western Coastal Plains of India |
| Lava Plains | Columbia Plateau (USA) |
- The Indo-Gangetic Plain is one of the most fertile plains in the world.
- Most major civilizations developed on fertile plains.
- Plains are densely populated due to favourable living conditions.
Quick Revision
- Most Fertile Plain → Indo-Gangetic Plain
- Best for Agriculture → Plains
- High Population → Plains
Atmosphere
The atmosphere is the blanket of gases surrounding the Earth. It protects life by providing oxygen, regulating temperature and shielding the Earth from harmful solar radiation.
- Layers of the Atmosphere
- Composition of Air
- Ozone Layer
- Weather Phenomena
| Layer | Main Feature |
|---|---|
| Troposphere | Weather changes occur here. |
| Stratosphere | Contains the ozone layer. |
| Mesosphere | Meteors burn up here. |
| Thermosphere | Auroras occur here. |
| Exosphere | Outermost atmospheric layer. |
- The Troposphere is the lowest atmospheric layer.
- The Stratosphere contains the ozone layer.
- The ozone layer absorbs harmful ultraviolet (UV) rays.
- Most weather phenomena occur in the Troposphere.
Quick Revision
- Weather → Troposphere
- Ozone Layer → Stratosphere
- Meteors → Mesosphere
- Outermost Layer → Exosphere
Weather and Climate
Weather refers to the day-to-day condition of the atmosphere at a particular place, while climate is the average weather condition of a region over a long period.
| Weather | Climate |
|---|---|
| Short-term atmospheric condition. | Long-term average weather. |
| Changes frequently. | Changes slowly. |
| Forecast for days. | Studied over many years. |
- Temperature, humidity, rainfall and wind are elements of weather.
- Climate influences agriculture, vegetation and human lifestyle.
Quick Revision
- Weather → Daily Changes
- Climate → Long-Term Pattern
Winds
Wind is the horizontal movement of air from a high-pressure area to a low-pressure area. Winds play an important role in regulating weather and climate.
| Type of Wind | Example |
|---|---|
| Planetary Winds | Trade Winds, Westerlies, Polar Easterlies |
| Seasonal Winds | Monsoon Winds |
| Local Winds | Loo, Chinook, Mistral |
- Trade Winds blow towards the Equator.
- Monsoon winds are seasonal winds.
- The Loo is a hot and dry local wind in northern India.
Quick Revision
- Seasonal Wind → Monsoon
- Hot Local Wind → Loo
- Pressure Difference → Wind
Humidity
Humidity is the amount of water vapour present in the atmosphere. High humidity makes the air feel warmer, while low humidity makes it feel drier.
| Instrument | Measures |
|---|---|
| Hygrometer | Humidity |
| Thermometer | Temperature |
| Barometer | Atmospheric Pressure |
- Humidity is highest near oceans and coastal regions.
- Relative humidity is expressed as a percentage.
Quick Revision
- Humidity → Hygrometer
- Pressure → Barometer
- Temperature → Thermometer
Rainfall
Rainfall occurs when water vapour condenses into tiny droplets that become heavy enough to fall to the Earth’s surface.
| Type | Main Cause |
|---|---|
| Convectional Rainfall | Heating of the Earth’s surface. |
| Orographic Rainfall | Mountains force moist air to rise. |
| Cyclonic Rainfall | Meeting of different air masses. |
- Orographic rainfall is common on windward mountain slopes.
- Rain shadow regions receive very little rainfall.
- Rainfall is measured using a rain gauge.
Quick Revision
- Instrument → Rain Gauge
- Mountain Rain → Orographic
- Surface Heating → Convectional
Oceans
Oceans cover about 71% of the Earth’s surface and play an important role in regulating climate, supporting marine life and facilitating global trade.
| Ocean | Special Feature |
|---|---|
| Pacific Ocean | Largest and deepest ocean. |
| Atlantic Ocean | Second-largest ocean. |
| Indian Ocean | Only ocean named after a country. |
| Southern Ocean | Surrounds Antarctica. |
| Arctic Ocean | Smallest and shallowest ocean. |
- The Pacific Ocean is the largest ocean.
- The Arctic Ocean is the smallest ocean.
- The Indian Ocean is named after India.
Quick Revision
- Largest Ocean → Pacific
- Smallest Ocean → Arctic
- Named After India → Indian Ocean
Ocean Currents
Ocean currents are continuous movements of seawater caused by wind, Earth’s rotation, temperature differences and salinity.
| Current | Type |
|---|---|
| Gulf Stream | Warm Current |
| Kuroshio Current | Warm Current |
| Labrador Current | Cold Current |
| Canary Current | Cold Current |
- Warm currents generally raise coastal temperatures.
- Cold currents generally lower coastal temperatures.
- Ocean currents influence climate and marine life.
Quick Revision
- Warm → Gulf Stream
- Cold → Labrador
- Climate Influenced By → Ocean Currents
Tides
Tides are the regular rise and fall of sea levels caused mainly by the gravitational pull of the Moon and, to a lesser extent, the Sun.
| Type | Description |
|---|---|
| High Tide | Rise in sea level. |
| Low Tide | Fall in sea level. |
| Spring Tide | Occurs during the new moon and full moon. |
| Neap Tide | Occurs during the first and third quarter phases of the Moon. |
- The Moon has a greater influence on tides than the Sun.
- Spring tides are higher than normal tides.
- Neap tides have a smaller tidal range.
Quick Revision
- Main Cause → Moon
- Highest Tides → Spring Tide
- Lowest Tidal Range → Neap Tide
Continents
A continent is a large continuous landmass on the Earth’s surface. There are seven continents, each with unique physical features, climate and biodiversity.
| Continent | Important Fact |
|---|---|
| Asia | Largest and most populous continent. |
| Africa | Second-largest continent. |
| North America | Third-largest continent. |
| South America | Home to the Amazon Rainforest. |
| Antarctica | Coldest continent. |
| Europe | Known as the “Peninsula of Peninsulas”. |
| Australia | Smallest continent. |
- Asia has the highest mountain (Mount Everest).
- Africa is crossed by both the Equator and the Prime Meridian.
- Australia is also the smallest continent.
- Antarctica has no permanent human population.
Quick Revision
- Largest → Asia
- Smallest → Australia
- Coldest → Antarctica
- Amazon Rainforest → South America
Important Rivers of the World
| River | Important Fact |
|---|---|
| Nile | Longest river in Africa. |
| Amazon | Largest river by water discharge. |
| Yangtze | Longest river in Asia. |
| Mississippi–Missouri | Major river system of North America. |
| Ganga | Most important river of India. |
| Brahmaputra | Originates in Tibet. |
- The Amazon carries the greatest volume of water.
- The Nile is traditionally regarded as the longest river in the world.
- The Ganga is India’s national river.
Quick Revision
- Longest River → Nile
- Largest by Water Volume → Amazon
- National River of India → Ganga
Major Deserts of the World
| Desert | Location |
|---|---|
| Sahara | Africa |
| Thar | India & Pakistan |
| Gobi | Mongolia & China |
| Kalahari | Southern Africa |
| Arabian Desert | Saudi Arabia |
| Antarctic Desert | Antarctica |
- The Antarctic Desert is the largest desert in the world.
- The Sahara is the largest hot desert.
- The Thar Desert is also known as the Great Indian Desert.
Quick Revision
- Largest Desert → Antarctic Desert
- Largest Hot Desert → Sahara
- Indian Desert → Thar
Major Types of Forests
| Forest Type | Main Region |
|---|---|
| Tropical Rainforest | Amazon Basin |
| Deciduous Forest | India, Europe |
| Coniferous Forest | Canada, Russia |
| Mangrove Forest | Coastal Areas |
- The Amazon Rainforest is the largest tropical rainforest.
- The Sundarbans is the largest mangrove forest in the world.
- Coniferous forests are also called Taiga forests.
Quick Revision
- Largest Rainforest → Amazon
- Largest Mangrove → Sundarbans
- Taiga → Coniferous Forest
Biosphere
The biosphere is the zone of the Earth where life exists. It includes parts of the atmosphere, hydrosphere and lithosphere that support living organisms.
| Sphere | Description |
|---|---|
| Lithosphere | Land portion of the Earth. |
| Hydrosphere | Water bodies of the Earth. |
| Atmosphere | Layer of gases around the Earth. |
| Biosphere | Region where life exists. |
- The biosphere supports all living organisms.
- Life exists where land, water and air interact.
- Humans are a part of the biosphere.
Quick Revision
- Land → Lithosphere
- Water → Hydrosphere
- Air → Atmosphere
- Life → Biosphere
Most Frequently Asked Geography Facts
📌 One-Minute Revision
- ✔ Earth is the third planet from the Sun.
- ✔ Earth is an oblate spheroid (Geoid).
- ✔ Rotation causes day and night.
- ✔ Revolution causes seasons.
- ✔ Equator → 0° Latitude.
- ✔ Prime Meridian → 0° Longitude.
- ✔ IST is based on 82½° E Longitude.
- ✔ Thickest Earth Layer → Mantle.
- ✔ Weather occurs in the Troposphere.
- ✔ Ozone Layer is in the Stratosphere.
- ✔ Largest Ocean → Pacific.
- ✔ Smallest Ocean → Arctic.
- ✔ Largest Continent → Asia.
- ✔ Smallest Continent → Australia.
- ✔ Highest Peak → Mount Everest.
- ✔ Largest Hot Desert → Sahara.
- ✔ Largest Desert → Antarctic Desert.
- ✔ Longest River → Nile.
- ✔ Largest Rainforest → Amazon.
- ✔ Largest Mangrove Forest → Sundarbans.
Conclusion
Geography is one of the most important subjects for SSC, Railway, Banking, Defence, Police and State Government examinations. Topics such as the Earth, latitudes and longitudes, atmosphere, climate, rivers, mountains, oceans and continents are regularly asked in competitive exams.
Regular revision of geographical facts, important landforms, climatic concepts and world geography will improve your understanding and help you score well in the General Awareness section. After completing these notes, practice topic-wise MCQs to strengthen your concepts and improve your speed.
These Geography Notes are designed in a simple and exam-oriented format to help beginners as well as competitive exam aspirants revise quickly and effectively. Bookmark this page and revise it regularly to improve your performance in upcoming examinations.