Chapter 1: Locating Places on the Earth
š 1. Introduction
- The Earth is very large, and we need ways to find exact locations on it.
- People use maps, globes, directions, and coordinates to locate places.
- This chapter teaches how to understand the Earth’s position system.
š 2. Globe – A Model of Earth
- A globe is a small spherical model of the Earth.
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It shows:
- Continents
- Oceans
- Countries
- It is the most accurate representation of Earth because it shows correct shape.
š Limitation:
- Cannot carry easily
- Cannot show detailed information
šŗ️ 3. Maps
- A map is a flat drawing of the Earth or part of it.
- Maps are easy to carry and use.
Types of Maps:
- Physical Map – shows mountains, rivers, plains
- Political Map – shows countries, states, cities
- Thematic Map – shows specific things (rainfall, population)
š§ 4. Directions
To find location, we use directions.
Main Directions:
- North (N)
- South (S)
- East (E)
- West (W)
Intermediate Directions:
- North-East (NE)
- North-West (NW)
- South-East (SE)
- South-West (SW)
š Example:
- Sun rises in the East and sets in the West
š 5. Latitudes (Parallels)
- Latitudes are imaginary horizontal lines on Earth.
- They run from East to West.
Important Latitudes:
- Equator (0°) → divides Earth into Northern & Southern Hemisphere
- Tropic of Cancer (23½° N)
- Tropic of Capricorn (23½° S)
- Arctic Circle (66½° N)
- Antarctic Circle (66½° S)
š Uses:
- Helps in measuring distance from Equator
- Affects climate (hot, cold areas)
š 6. Longitudes (Meridians)
- Longitudes are imaginary vertical lines.
- They run from North Pole to South Pole.
Important Longitude:
- Prime Meridian (0°) → passes through Greenwich (UK)
š Uses:
- Helps to find time
- Divides Earth into Eastern & Western Hemisphere
⏰ 7. Time and Longitudes
- Earth rotates from West to East.
- Different places have different times.
š Key Concept:
- 1° longitude = 4 minutes difference
Indian Standard Time (IST):
- Based on 82½° E longitude
- Ensures same time across India
š 8. Grid System (Coordinates)
- Combination of Latitude + Longitude
- Helps to find exact location of a place
š Example:
- If we know both latitude & longitude → we can find any place accurately.
š 9. Hemispheres
Earth is divided into parts:
- Northern Hemisphere
- Southern Hemisphere
- Eastern Hemisphere
- Western Hemisphere
š” 10. Importance of Locating Places
- Helps in travel and navigation
- Used in GPS and maps
- Important for trade, weather, and communication
š Important Points (Exam Ready)
- Globe = true model of Earth
- Maps = flat representation
- Latitudes = horizontal lines
- Longitudes = vertical lines
- Equator = 0° latitude
- Prime Meridian = 0° longitude
- IST = 82½° E
- Coordinates = exact location system
⭐ Short Summary
This chapter explains how we locate places using maps, directions, latitudes, and longitudes. It helps us understand Earth scientifically and find any place accurately.