📝 Chapter Notes & Revision

Maps

🏫 MP BoardClass 6Social Science

📐 Formula & Cheat Sheet (English)

Quick Revision Notes & Formula Sheet

Class: 6th
Subject: Social Science (Geography)
Chapter: Maps

### 1. Introduction to Maps

  • Map: A representation or a drawing of the earth’s surface or a part of it drawn on a flat surface according to a scale.
  • Atlas: A collection of maps of different sizes, scales, and regions bound together in a book.
  • Why do we need maps? Maps are more useful than a globe when we want to study only a part of the earth, a country, a district, a town, or a village.

### 2. Types of Maps

Maps provide different types of information based on what they show. The three major types are:

  1. Physical Maps (उच्चavachttar Manchitra):
    • Shows natural features of the earth such as mountains, plateaus, plains, rivers, oceans, etc.
  2. Political Maps (राजनीतिक मानचित्र):
    • Shows cities, towns, villages, and different countries and states of the world with their boundaries.
  3. Thematic Maps (विषматиय मानचित्र):
    • Focuses on specific information, such as road maps, rainfall maps, maps showing distribution of forests, industries, population, etc.

### 3. Three Components of Maps

Maps have three essential components: Distance, Direction, and Symbol.

A. Distance

  • Maps are drawn to reduced scales.
  • Scale: The ratio between the actual distance on the ground and the distance shown on the map. $$\text{Scale} = \frac{\text{Distance on the Map}}{\text{Corresponding Distance on the Ground}}$$
  • Types of Scale on Maps:
    • Small Scale Map: Used to show large areas like continents or countries on a small sheet (e.g., 5 cm = 500 km).
    • Large Scale Map: Used to show a small area like a village or town on paper with greater detail (e.g., 5 cm = 500 meters).

B. Direction

  • Most maps contain an arrow marked with the letter 'N' at the upper right-hand corner. This arrow shows the North direction (North line).
  • Four Major Directions (Cardinal Points): North (N), South (S), East (E), and West (W).
  • Intermediate Directions:
    • North-East (NE)
    • South-East (SE)
    • South-West (SW)
    • North-West (NW)
  • Compass: An instrument used to find main wind directions. The magnetic needle always points towards North-South direction.

C. Symbols

  • It is impossible to draw on a map the actual shape and size of features like buildings, roads, bridges, trees, or railway lines. Therefore, they are shown by using certain letters, shades, colors, pictures, and lines.
  • Conventional Symbols: These are internationally accepted symbols agreed upon by universal use for mapping features so that anyone can read any map in the world regardless of language barriers.

### 4. Sketch vs. Plan

FeatureSketch (रेखाचित्र)Plan (खाका)
DefinitionA drawing mainly based on memory and spot observation and not to scale.A drawing of a small area on a large scale.
ScaleDoes not use a scale.Uses a proper scale.
UsageUsed to show where a particular place is located with respect to other places.Used to show details that we cannot usually see on a map (e.g., length and breadth of a room).

### 5. Quick Review Points (Important for Exams)

  • Globe vs. Map: A globe gives a 3D view of the entire earth, while a map gives a 2D (flat) view of the whole earth or a part of it.
  • Colors used in Maps (Standard Convention):
    • Blue: Water bodies (oceans, seas, rivers)
    • Brown: Mountains and highlands
    • Yellow: Plateaus
    • Green: Plains and lowlands