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CBSE • Class 6 • Social Science • Ch 3

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In the Earliest Cities (History)

In CBSE Class 6 History, "In the Earliest Cities" explores the bronze-age Indus Valley Civilization (Harappan Civilization, c. 2600–1900 BCE). Students examine urban planning (Citadel and Lower Town, baked brick architecture), drainage systems, the Great Bath at Mohenjo-Daro, crafts and metallurgy (copper, bronze, gold, silver, carnelian beads, terracotta toys, steatite seals), trade networks, and specific excavations at Kalibangan (fire altars), Lothal (dockyard, bead factory), and Dholavira (three-tier city, rainwater harvesting).

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🧱 Have You Ever Wondered?

Did you know that 4,500 years ago, Harappan cities had covered underground bathroom drains and multistory brick houses cleaner than medieval European capitals?

The Indus Valley Civilization was the world's greatest urban marvel of the Bronze Age! Explore the grand streets, dockyards, and trade seals of Mohenjo-Daro and Lothal.

Why This Chapter Matters

Before You Begin (Prerequisites)

Awareness of Indus River
Difference between village and planned city

What You Will Learn (Core Objectives)

Describe Harappan urban layout: Citadel (West) and Lower Town (East).
Explain the construction and religious purpose of the Great Bath at Mohenjo-Daro.
Analyze the covered drainage system with inspection chambers.
Identify Harappan crafts: steatite seals, bronze dancing girl, carnelian beads, terracotta weights.
Examine Lothal (tidal dockyard) and Dholavira (stone walls, reservoir) and theories of decline.

Chapter Roadmap & Progression

1 1. Urban Architecture: Citadel & Lo...

2 2. The Great Bath & Covered Drainag...

3 3. Trade, Crafts, Special Sites & D...

Complete Concept Guide (100% Curriculum Coverage)

1. Urban Architecture: Citadel & Lower Town

About 4,700 years ago, Harappa and Mohenjo-Daro emerged along the Indus basin. Cities were divided into two main parts:

The Citadel (Western part): Smaller but built on higher raised mud-brick platforms. Contained special public buildings and administrative structures.
The Lower Town (Eastern part): Larger in area, located at ground level, containing residential grid-patterned houses for ordinary citizens.
Baked Brick Masonry: Buildings were constructed using interlocking standardized kiln-baked bricks so durable that British railway contractors in the 1850s used thousands of Harappan bricks to lay railway ballast!

2. The Great Bath & Covered Drainage Systems

The Great Bath at Mohenjo-Daro

A special brick-lined water tank in the Citadel used for ritual ceremonial bathing. It was lined with baked bricks, coated with plaster, and made watertight using a natural layer of bitumen (tar). Steps led down from two sides, with dressing rooms on three sides and a drainage channel to empty the tank.

Engineering Wonder: The Harappan Drainage System

Every house had its own paved bathroom connected through walls to covered street drains.
Street drains ran along straight lines with gentle slopes so water flowed smoothly.
Drains were completely covered with stone slabs and bricks, with inspection holes placed at regular intervals for cleaning.
House drains emptied into larger street mains, which discharged outside city limits—an unmatched public health standard!

3. Trade, Crafts, Special Sites & Decline

Crafts & Trade

Metals used: Copper and bronze (for tools, weapons, ornaments), gold and silver (for jewelry).
Stone beads were crafted from red carnelian; seals were carved from steatite with animal motifs and undeciphered script.
Weights made of polished chert stone in binary and decimal units.

Key Harappan Sites

Kalibangan (Rajasthan) & Lothal (Gujarat): Contained fire altars where ritual sacrifices were performed.
Lothal: Located near the Gulf of Khambat. Had a tidal brick dockyard where ships loaded goods from the Arabian Sea, and a bead-making factory.
Dholavira (Rann of Kutch): Unlike other cities, divided into three distinct parts surrounded by massive stone walls with gateways, featuring giant stone-cut rainwater reservoirs and a large Harappan signboard.

Decline of Harappa (c. 1900 BCE)

Possible causes: drying up of rivers, deforestation and ecological degradation, floods, and collapse of administrative authority.

Key Historical Terms, Chronology & Administrative Principles

Interlocking Brick Bond

$$\text{Length} : \text{Breadth} : \text{Thickness} = 4 : 2 : 1$$

Standardized Harappan brick ratio.

Conceptual Solved Examples & Case Studies

Example 1

How was the Great Bath at Mohenjo-Daro made watertight?

Step-by-Step Solution:

The Great Bath was built of baked bricks, coated with plaster, and sealed with a thick natural layer of bitumen (tar) between brick layers to prevent water leakage.

Example 2

What was the function of the dockyard at Lothal?

Step-by-Step Solution:

Lothal was located along a tributary of the Sabarmati river in Gujarat near the Gulf of Khambat. Its massive baked-brick basin served as a tidal dockyard where merchant ships and boats entered from the sea during high tide to load and unload trade cargo (beads, copper, cotton).

Common Misconceptions & Examiner Traps

Common Misconception

Believing Harappans used iron tools.

Scientific Reality & Correction

The Harappan Civilization was a Bronze Age civilization! Iron was completely unknown to the Harappans; iron was introduced centuries later in the Vedic Age.

Visual Learning & Conceptual Map

Harappan Urban Planning Matrix

Civil Engineering Marvels of the Indus Valley

Citadel

Elevated western sector. Great Bath, granaries, public halls.

Drainage

Covered underground drains with inspection holes.

Lothal Port

Tidal brick dockyard connected to sea trade with Oman.

Dholavira

3-tier stone fortification and giant water reservoirs.

Chapter Summary & 10 Key Takeaways

Takeaway 1

Harappan civilization flourished around 2600-1900 BCE along the Indus basin.

Takeaway 2

Cities featured citadels, grid residential layouts, and baked brick houses.

Takeaway 3

Streets had covered drainage systems with inspection chambers.

Takeaway 4

Lothal was a major coastal port; Dholavira featured 3-part stone architecture.

Takeaway 5

Harappans used bronze, copper, gold, silver, steatite seals, and carnelian beads.

Check Your Understanding (Diagnostic Practice Questions)

Diagnostic questions testing core conceptual clarity. Answers are hidden initially — solve each problem first, then click to reveal the step-by-step verified solution.

Why was the Harappan drainage system considered ahead of its time?

Reveal Answer & Explanation

Answer: Drains were completely covered underground, connected every house bathroom to main street sewers, had gentle slopes for smooth flow, and included regular inspection manholes for cleaning—preventing epidemics and foul odors.
Think of public sanitation and inspection manholes.

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