Locating Places and Reading Maps
Social Science helps us explore how we live as social beings, our interactions within society and our relationship with the land and environment. Unlike physical sciences with single answers, social science develops critical spatial awareness.
1. Shape of Earth and the Globe
The Oblate Spheroid
Earth is shaped like an oblate spheroid — bulging at the Equator and flat at the top and bottom.
- Equatorial Diameter:12,756 km
- Polar Diameter:12,714 km
- Orbital Tilt Angle:66.5° to orbital plane
A globe is a 3D model showing landmasses, oceans and the tilted axis of rotation.
2. Latitudes & Heat Zones of Earth
Latitudes are imaginary horizontal circles drawn parallel to the Equator. They measure distance North or South of the Equator in degrees (°).
Direct Sunlight
Between Tropic of Cancer (23.5° N) & Tropic of Capricorn (23.5° S). Receives maximum heat.
Moderate Climate
Between Tropics and Polar Circles (23.5° to 66.5° N/S). Sun rays strike at slanting angles.
Extremely Cold
Beyond Arctic/Antarctic Circles (66.5° to 90° N/S). Sun never rises high above horizon.
3. Longitudes & Interactive Time Zone Calculator
Understanding Longitude & Time
Longitudes run vertically from North to South Pole. The 0° Prime Meridian passes through Greenwich, London.
• 360° Rotation = 24 Hours
• 15° Longitude = 1 Hour (60 mins)
• 1° Longitude = 4 Minutes
• Indian Standard Time (IST) = 82.5° E (GMT +5 hours 30 mins)
Interactive Time Difference Calculator
Slide to select degrees of longitude difference from GMT:
(30 degrees × 4 mins/degree = 120 mins ahead of Greenwich)
4. Maps, Types & Essential Components
Physical Maps
Show natural relief features of the Earth such as mountains, plateaus, plains, rivers and oceans.
Political Maps
Show boundaries of countries, states, districts, towns and cities with political administrative divisions.
Thematic Maps
Focus on specific information such as rainfall distribution, road maps, forests, industries or population.
The 3 Key Components of a Map
Distance & Scale
Ratio between map distance and real ground distance (e.g. 1 cm = 100 km).
Directions & Compass
4 Cardinal directions (N, S, E, W) and 4 Intermediate points (NE, SE, NW, SW).
Symbols & Legend
International conventional signs for roads, railways, rivers, bridges & forests.
5. Interactive Knowledge Quiz
Test your understanding of Chapter 1 concepts. Select your answers below:
Q1. What is the true shape of the Earth?
Q2. At what angle is the Earth's axis tilted relative to its orbital plane?
Q3. How much time difference corresponds to 1 degree of longitude?
Q4. Which line serves as the Standard Meridian for Indian Standard Time (IST)?
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