2.14 World Physical, Social & Economic Geography
Key Takeaways
- The CIL Paper-I syllabus asks for physical, social and economic geography of India AND the world, so world geography is examinable in its own right.
- The Tropic of Cancer passes through eight Indian states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram.
- The Pacific is the largest and deepest ocean, containing the Mariana Trench, while the Sahara is the largest hot desert and Antarctica the largest cold desert.
- China is the world's largest coal producer and India the second, which makes global coal geography directly relevant to this exam.
Continents and Oceans
| Continent | Rank by area | Notable feature |
|---|---|---|
| Asia | 1 | Largest by area and population; contains Everest |
| Africa | 2 | Contains the Sahara and the Nile |
| North America | 3 | Great Lakes; Rocky Mountains |
| South America | 4 | Amazon basin; Andes, the longest continental mountain range |
| Antarctica | 5 | Coldest continent; a cold desert |
| Europe | 6 | Smallest inhabited landmass after Australia |
| Australia | 7 | Smallest continent |
| Ocean | Note |
|---|---|
| Pacific | Largest and deepest; contains the Mariana Trench, the deepest point on Earth |
| Atlantic | Second largest; S-shaped |
| Indian | Third largest; the only ocean named after a country |
| Southern | Encircles Antarctica |
| Arctic | Smallest and shallowest |
Superlatives Worth Memorising
| Category | Answer |
|---|---|
| Highest peak | Mount Everest, 8,848.86 m, on the Nepal-China border |
| Longest river | The Nile is conventionally cited as longest; the Amazon carries by far the greatest discharge |
| Largest desert (hot) | Sahara, Africa |
| Largest desert overall | Antarctica, a cold desert |
| Largest island | Greenland |
| Largest lake by area | Caspian Sea |
| Deepest lake | Lake Baikal, Russia |
| Largest freshwater lake by area | Lake Superior |
| Longest mountain range | Andes on land; the mid-ocean ridge system if submarine ranges are counted |
| Highest plateau | Tibetan Plateau, the roof of the world |
| Largest coral reef | Great Barrier Reef, Australia |
Latitude, Longitude and Reference Lines
- Latitude measures angular distance north or south of the Equator, from 0 to 90 degrees. Longitude measures east or west of the Prime Meridian, from 0 to 180 degrees.
- The Equator is 0 degrees latitude and divides the Earth into the Northern and Southern Hemispheres.
- The Tropic of Cancer at about 23.5 degrees North passes through eight Indian states: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram. The Tropic of Capricorn lies at about 23.5 degrees South.
- The Arctic Circle and Antarctic Circle lie at about 66.5 degrees North and South.
- The Prime Meridian passes through Greenwich, London. The International Date Line roughly follows 180 degrees longitude, deviating to avoid splitting landmasses.
- India's standard meridian is 82 degrees 30 minutes East, passing near Mirzapur in Uttar Pradesh, which sets Indian Standard Time at UTC plus five and a half hours.
Straits, Canals and Chokepoints
| Feature | Connects |
|---|---|
| Strait of Malacca | Andaman Sea and South China Sea; a principal trade artery |
| Strait of Hormuz | Persian Gulf and Gulf of Oman; critical for oil shipment |
| Bab-el-Mandeb | Red Sea and Gulf of Aden |
| Strait of Gibraltar | Mediterranean Sea and Atlantic Ocean |
| Bering Strait | Asia and North America; Pacific and Arctic |
| Palk Strait | India and Sri Lanka |
| Suez Canal (1869) | Mediterranean and Red Sea; avoids the voyage around Africa |
| Panama Canal (1914) | Atlantic and Pacific across Central America |
These chokepoints matter economically because India imports coking coal, crude oil and liquefied natural gas along these routes.
Climate Zones and Winds
Moving from the Equator poleward, the broad zones are equatorial, tropical, subtropical, temperate and polar. Key wind systems:
| Wind | Character |
|---|---|
| Trade winds | Blow from subtropical high-pressure belts towards the Equator |
| Westerlies | Blow from subtropical highs towards the poles |
| Monsoon | Seasonally reversing winds; the Indian southwest monsoon arrives around June and withdraws by September |
| Local winds | Loo (northern India, hot summer wind), Chinook (North America), Foehn (Alps), Harmattan (West Africa) |
The El Nino phenomenon, an abnormal warming of the eastern Pacific, is associated with weaker Indian monsoon rainfall, while La Nina is broadly the reverse. This link is a standard objective item and a genuine economic concern for Indian agriculture and hydropower.
World Economic Geography: Coal and Energy
This is the portion of world geography most relevant to a Coal India paper.
Coal
| Position | Country |
|---|---|
| Largest coal producer | China |
| Second largest producer | India |
| Other major producers | Indonesia, United States, Australia, Russia |
| Largest exporters | Indonesia and Australia |
India is simultaneously the world's second-largest coal producer and a substantial importer, chiefly of coking coal for steelmaking, because domestic coking coal is limited in quantity and high in ash. This is precisely why Mission Coking Coal exists as a policy, and why BCCL's prime coking coal reserves in the Jharia field carry strategic weight.
Other resources
| Resource | Leading producers |
|---|---|
| Crude oil | United States, Saudi Arabia, Russia |
| Natural gas | United States, Russia |
| Iron ore | Australia, Brazil, China, India |
| Bauxite | Australia, Guinea, China |
| Gold | China, Australia, Russia |
| Uranium | Kazakhstan, Canada, Australia |
The Organization of the Petroleum Exporting Countries, headquartered in Vienna, coordinates oil production policy among its members and its decisions feed through to Indian import costs and inflation.
Social Geography
- Population: India and China are the world's most populous countries. India's population data come from the decennial Census conducted by the Office of the Registrar General and Census Commissioner.
- Density is population per square kilometre; sex ratio in India is conventionally expressed as females per thousand males.
- Urbanisation is the rising share of population living in urban areas, driven by industrial and service employment.
- Demographic dividend describes a period when the working-age share of population is high relative to dependants, a phase India is currently in and one frequently referenced in economic policy discussion.
- Human Development Index, published by the United Nations Development Programme, combines life expectancy, education and per-capita income into a single measure.
Revision Approach
World geography rewards map work over reading. Sketch a blank world outline and place, from memory, the continents, the five oceans, the Equator and both tropics, the eight strait and canal chokepoints, and the major coal-producing countries. Repeating that exercise three or four times fixes more than an hour of passive reading, and it directly serves the map-based items that appear in the General Awareness section.
The Tropic of Cancer passes through how many Indian states?
The deepest point in the world's oceans, the Mariana Trench, lies in the:
The world's largest producer of coal is:
India's standard meridian, which fixes Indian Standard Time, is: