Class 8 Social Science Part 2 Chapter 3 – A Journey Through Indian Architecture | NCERT Notes & Book Solutions

Class 8 Social Science Part 2 Chapter 3 – A Journey Through Indian Architecture from the new NCERT textbook Exploring Society: India and Beyond. Get easy Notes and complete Book Solutions with important concepts, questions and answers, and revision material for effective learning, practice and exam preparation.

Class 8 Social Science Chapter 3 | A Journey Through Indian Architecture | Notes & Solutions

🏛️ A Journey Through Indian Architecture

Class 8 Social Science | Exploring Society: India and Beyond – Part 2

Chapter 3 – Colourful Concept Notes, Easy Book Solutions, Important Terms, Monuments and Quick Revision

🌟 Chapter at a Glance

Architecture is the art and technique of designing and constructing buildings and other structures. Indian architecture has developed over thousands of years and shows great variety because India has different regions, climates, materials, religions and cultural traditions.

⭐ Main idea: Indian architecture is not only about beautiful buildings. It also shows scientific knowledge, engineering, mathematics, religion, social life, climate adaptation and artistic skills.

In this chapter we travel through different types of Indian architecture: Harappan cities, stupas, rock-cut caves, temples, water structures, mosques, forts, palaces, tombs, traditional houses, churches and colonial buildings.

❓ The Big Questions
1. Role of Architecture

Architecture records the achievements, beliefs, technology and lifestyle of a civilisation.

2. Key Concepts

Indian architecture developed through planning, engineering, geometry, religious ideas, local materials and regional styles.

3. Relevance Today

Architectural heritage helps us understand our past and reminds us to preserve our shared cultural heritage.

💭 Thought to Remember

“The craftsman is not an individual expressing individual whims, but a part of the universe, giving expression to ideals of eternal beauty and unchanging laws…”

— Ananda Coomaraswamy

⏳ Architecture Through Time
c. 2600 BCE – Dholavira

Harappan urban planning, reservoirs and stone construction.

3rd–1st centuries BCE – Sanchi & Bharhut

Stupa architecture developed with railings, gateways and carved panels.

2nd century BCE onward – Rock-cut caves

Udayagiri-Khandagiri, Ajanta and Ellora show extraordinary rock carving.

Gupta era onward – Classical temples

Temples developed important parts such as garbhagriha, mandapa and shikhara.

11th–13th centuries – Dilwara Temples

White marble Jain temples famous for delicate carving.

15th–17th centuries – Mosques, forts and palaces

Jama Masjids, Mehrangarh, Agra Fort and other monumental structures.

16th–17th centuries – Humayun’s Tomb and Taj Mahal

Symmetry, gardens, domes, arches, marble and decorative arts.

19th–20th centuries – Colonial & Indo-Saracenic

Indian, Islamic and European architectural elements were combined.

🏙️ 1. Harappan Architecture

What makes Harappan architecture special?

  • Carefully planned cities.
  • Wide streets and narrow lanes.
  • Standardised construction methods.
  • Excellent drainage systems.
  • Bathing areas in many houses.
  • Water management systems.
  • Use of bricks in many cities.
Easy idea: Harappan cities show that people had strong knowledge of town planning, sanitation and water management thousands of years ago.
Mohenjo-daro
Mohenjo-daro – an important Harappan urban centre

🏠 Mohenjo-daro

Mohenjo-daro, in present-day Sindh, Pakistan, was a large Harappan city. Its streets were broadly oriented according to cardinal directions.

Almost every house had a bathing area, and used water was carried away through an efficient drainage system.

Remember: Mohenjo-daro = planned streets + houses + bathing areas + drains.

💧 Dholavira

Dholavira was a major Harappan city in the Rann of Kachchh. Unlike many other Harappan cities, it made extensive use of locally available stone.

It had fortified areas, streets and large reservoirs.

Dholavira
Dholavira – famous for urban planning and water management
☸️ 2. Structural Stupa Architecture

What is a Stupa?

A stupa is a dome-shaped Buddhist structure that could contain relics associated with the Buddha or revered monks.

  • Stupas were built mainly with brick or stone.
  • Larger stupas became important ritual centres.
  • They could have railings and gateways.
  • Carved panels often showed stories and scenes.
Sanchi Stupa
Sanchi Stupa – a major example of Buddhist architecture

🛕 Sanchi Stupa

The main stupa at Sanchi in Madhya Pradesh represents an early phase of monumental religious stone architecture in India.

Worshippers entered through ornamental toraṇas and walked around the stupa inside the railing enclosure.

🌸 Bharhut Stupa

Bharhut also had a richly carved stone railing. Inscriptions recorded the names of donors.

Important: In early Buddhist art, the Buddha was often represented symbolically through footprints, the Dharma wheel or the stupa rather than through a human figure.
⛰️ 3. Rock-Cut Architecture

Rock-cut architecture means creating buildings, caves or halls by cutting directly into natural rock.

These structures were used for worship, residence and assembly.

Major examples

Udayagiri-Khandagiri

Near Bhubaneswar in Odisha; associated largely with Jain monks.

Ajanta

Famous for rock-cut Buddhist caves and paintings.

Ellora

Contains Buddhist, Hindu and Jain caves.

Kailasha Temple

A colossal monolithic temple carved from rock at Ellora.

Ellora Caves
Ellora – magnificent rock-cut architecture

🔨 How was rock-cut architecture created?

Skilled craftsmen used tools such as hammers and chisels to remove unwanted rock. They had to plan the structure carefully because mistakes could damage the entire monument.

Key term – Pradakshina: Walking around a sacred object in a clockwise direction.
✨ Important Monuments to Know
Sharada Peetha

A historic centre of learning in Kashmir associated with Goddess Sharada and the Sharada script.

Hidimba Devi Temple

Located in Manali among cedar forests; associated with Hidimba and the Mahabharata tradition.

Jageshwar Group of Temples

Ancient stone temple complex in Uttarakhand with many temples dedicated to different deities.

Golden Temple

Harmandir Sahib in Punjab is one of the most important Sikh places of worship.

💧 4. Water Structures

India’s monsoon climate encouraged people to develop many methods for harvesting, storing and distributing water.

  • Village ponds
  • Reservoirs
  • Wells
  • Stepwells
  • Temple tanks
  • Canals and channels

🔷 Harappan Wells

Harappan wells could use trapezoid-shaped bricks that locked together. This helped prevent the well walls from collapsing inward.

🌊 Shringaverpur

Shringaverpur in Uttar Pradesh had a series of interconnected reservoirs. They were fed by a channel from the Ganga during seasonal flooding.

Rani ki Vav
Rani ki Vav – a famous stepwell

🪜 Stepwells

Stepwells, called vāvs or bāorīs, developed especially in Gujarat and Rajasthan.

They were used to store water and also became social spaces where people could sit, meet and escape the heat.

🏺 Pushkarinis

Temple reservoirs or pushkarinis were used for water harvesting and rituals. Many were beautifully designed with stairways.

⚠️ Present-day problem: Many traditional water structures face pollution, waste dumping, maintenance problems and depletion of water sources.
🛕 5. Classical Temple Architecture

Temples have been central to Indian cultural life for centuries. They were not only places of worship but also centres of learning, art, music, dance, literature and social interaction.

🔑 Important Temple Parts

Gopuram

Ceremonial entrance, especially prominent in South Indian temples.

Toraṇa

Ornamental gateway used in some temples.

Maṇḍapa

Pillared hall.

Garbhagṛiha

Innermost sacred chamber containing the deity’s image.

Śhikhara

Upper tower above the garbhagriha in North Indian temples.

Vimāna

Temple tower above the main shrine in South Indian traditions.

Prākāra

Enclosing wall around temple areas.

Pradakshina

Clockwise circumambulation around a sacred object or space.

🌌 Temple as Puruṣha

Temple planning can symbolically represent the human body or cosmic being called Puruṣha.

The temple can therefore be understood as a connection between human beings, the divine and the cosmos.

Easy way to remember:
Temple journey = Outer world → Entrance → Mandapa → Garbhagriha → Inner spiritual world.
Brihadisvara Temple
Brihadisvara Temple, Thanjavur

🏛️ Brihadisvara Temple

Built by Rajaraja Chola I around 1010 CE at Thanjavur, the Brihadisvara Temple is famous for its huge vimana, large mandapas and detailed granite carvings.

🛕 Lingaraja Temple

The Lingaraja Temple at Bhubaneswar is dedicated to Shiva. It has several mandapas and richly carved sandstone and laterite architecture.

⚪ Dilwara Temples

The Dilwara Temples at Mount Abu are Jain temples famous for extremely delicate white marble carvings.

🧱 Bishnupur Terracotta Temples

Bishnupur in West Bengal is famous for brick temples decorated with detailed terracotta panels showing religious stories and everyday life.

Important observation: Different Indian temples have different regional styles, materials, tower shapes and decorative patterns, but many share ideas such as a sacred inner space, halls, symmetry and carefully planned layouts.
🕌 6. Architecture of Mosques

Mosques are places where Muslims gather for prayer. They can also function as centres of religious education and community activities.

Important features

  • Prayer hall oriented towards Mecca.
  • Domes in many larger mosques.
  • Minarets.
  • Arches.
  • Jālis or stone lattice screens.
  • Calligraphy.
  • Decorative floral patterns.
Jama Masjid Ahmedabad
Jama Masjid, Ahmedabad

🌿 Indo-Islamic Architecture

In many parts of India, Islamic architectural ideas were combined with local Indian craftsmanship. This produced forms commonly described as Indo-Islamic architecture.

Features could include domes, arches, jālis, floral designs, jharokhas and chhatris.

🕌 Jama Masjid, Delhi

Built by Mughal Emperor Shah Jahan in the mid-17th century, the Jama Masjid in Delhi has red sandstone, white marble decoration, large entrances, minarets and a spacious courtyard.

Mihrab: A niche in the wall indicating the direction of Mecca.
🏰 7. Forts and Palaces

Forts were built mainly for defence. They were often placed near important routes or on hills so rulers could observe the surrounding land.

Large forts could also contain palaces, homes, temples, mosques, stables, barracks and even entire settlements.

Mehrangarh Fort
Mehrangarh Fort, Jodhpur
Mehrangarh Fort

A massive fort overlooking Jodhpur, built mainly from locally available red sandstone.

Agra Fort

A major Mughal fort containing palaces, gardens, halls, mosques and water systems.

Orchha Fort-Palace

A Bundela Rajput complex showing a combination of Rajput and Mughal architectural influences.

Mysuru Palace

A famous Indo-Saracenic palace known for decorative interiors, stained glass and royal heritage.

💧 Agra Fort’s Water System

Water from the Yamuna was lifted using Persian wheels into overhead tanks. Terracotta pipes then carried water down to fountains.

The water system helped cool the fort complex.
⚱️ 8. Tombs and Mausoleums

A mausoleum is a grand building containing a tomb or group of tombs. In Islamic architectural traditions, rulers and other important people were sometimes commemorated through large mausoleums.

Humayun's Tomb
Humayun’s Tomb, Delhi

Humayun’s Tomb

Humayun’s Tomb was commissioned by Bega Begum in 1558. Persian architectural influence can be seen in its design.

The complex contains the tombs of several members of the Mughal family.

⭐ Taj Mahal

The Taj Mahal was built by Shah Jahan as a mausoleum for Mumtaz Mahal.

It combines architectural elements associated with Persian, Arabic and Indian traditions.

  • Charbagh garden design.
  • Large arches.
  • Arabic calligraphy.
  • Geometric designs.
  • Chhatris.
  • Lotus designs.
  • Marble screens.
  • Stone inlay work.
Taj Mahal
Taj Mahal, Agra
⚠️ Preservation example: Air pollution has affected the Taj Mahal’s marble. Protection of monuments requires pollution control, careful conservation and public cooperation.
🏠 9. Traditional Houses

Traditional Indian houses vary greatly according to geography, climate, local materials and social needs.

🌿 Central Courtyard Design

Many traditional houses have a central courtyard with rooms arranged around it.

  • Provides privacy.
  • Allows light and fresh air.
  • Helps keep rooms cool.
  • Provides space for family activities.
  • Can help manage rainwater when properly designed.
Shekhawati Haveli
Shekhawati Haveli – traditional courtyard house

🎨 Shekhawati Havelis

Havelis of Rajasthan’s Shekhawati region have courtyards and beautiful painted frescoes.

🌴 Chettinadu Houses

Chettinadu houses of Tamil Nadu are known for large courtyards, decorated wooden pillars, artistic work and adaptation to the local climate.

⛪ 10. Churches in India

Christian communities have lived in India for many centuries. According to tradition, some of the earliest churches were built in coastal Kerala.

Indian churches show both European architectural influences and local Indian traditions.

St. Philomena’s Cathedral

Located in Mysuru and built in the Gothic style.

St. Thomas Orthodox Church

At Mulanthuruthy, Kerala; includes local architectural features.

Kalloopara Church

Shows Kerala traditions such as a sloped tiled roof and wooden interiors.

🏛️ 11. Colonial & Indo-Saracenic Architecture

What is Indo-Saracenic Architecture?

Indo-Saracenic architecture was a distinctive colonial style that developed in India during the British Raj.

It combined elements associated with Islamic, Hindu and Gothic architecture.

Domes

Large rounded or bulbous roof structures.

Pointed Arches

Arches influenced by Gothic and Islamic traditions.

Minarets

Tower-like architectural elements.

Chhatris

Decorative pavilion-like structures.

🏛️ Madras High Court

Completed in 1892, the building combines Islamic arches and screens with decorative features associated with Indian styles.

🏛️ Victoria Memorial

Located in Kolkata, the Victoria Memorial is known for its central dome, arches, balconies and chhatris.

📖 Important Architectural Terms
Architecture

Art and techniques of designing and constructing structures.

Stupa

Dome-shaped Buddhist religious structure.

Toraṇa

Decorative gateway.

Garbhagṛiha

Innermost sacred chamber of a temple.

Maṇḍapa

Pillared hall in a temple.

Śhikhara

Tower above the shrine in many North Indian temples.

Vimāna

Upper structure above the shrine in South Indian temple traditions.

Jāli

Decorative lattice screen.

Jharokha

Overhanging balcony.

Chhatri

Pavilion-like domed structure.

Cenotaph

Memorial structure that does not contain the person’s body.

Mausoleum

Large building containing a tomb or group of tombs.

Corbelled

Built by stacking blocks in a step-like arrangement.

Gothic

European style known for pointed arches and large windows.

Indo-Islamic

Blending of Islamic building traditions with Indian craftsmanship.

Indo-Saracenic

Colonial style combining Indian, Islamic and European elements.

🧱 Building Materials & Technology

Indian builders used materials according to local availability and the purpose of the structure.

MaterialExamples / Uses
BrickHarappan cities, Bishnupur temples
StoneDholavira, Sanchi, temples, forts
GraniteBrihadisvara Temple
MarbleDilwara Temples, Taj Mahal
TerracottaBishnupur temple decorations
WoodTraditional houses and church interiors
Stone latticeJālis in mosques, palaces and tombs
Important: Many ancient structures depended on careful planning, precise cutting, interlocking elements, geometry and skilled craftsmanship rather than modern cement mortar.
🛡️ Why Should We Preserve Architectural Heritage?
  • It tells us about our ancestors.
  • It preserves knowledge of traditional technology.
  • It shows India’s cultural diversity.
  • It teaches us about art and engineering.
  • It connects present generations with history.
  • It encourages respect for different traditions.
Constitutional connection: Citizens have a Fundamental Duty to value and preserve the rich heritage of India’s composite culture.
📝 Questions and Activities – Easy Book Solutions
1. In Fig. 3.5, calculate the full width of the house; compare with the length of your classroom. How many staircases can you make out? If the house owners lived upstairs, what might the rooms downstairs be used for?
Easy Answer

The full width should be calculated by using the 5-metre scale shown in Fig. 3.5 and measuring the plan proportionately. The result can then be compared with the actual length of the student’s classroom.

The plan shows staircases connecting different levels.

If the owners lived upstairs, the rooms downstairs could have been used by servants, for storage, work areas or other household activities.

2. Form groups of four or five students and imagine you are artisans with just simple tools. Looking at Fig. 3.8, how would you go about building a dome of bricks? Looking at Fig. 3.12, how would you carve such a ceiling? Discuss and compare the different groups’ conclusions.
Easy Answer

To build a brick dome, we would first make a strong circular base. Then we would place bricks in carefully planned layers, gradually moving them inward until they meet at the top.

To carve the cave ceiling, we would first mark the design on the rock. Then we would remove unwanted rock slowly using hammers and iron chisels.

We would work carefully because a wrong cut could weaken the structure. The hillside could also have cracks, uneven rock or unstable sections.

3. Why should there be so many stairways in Fig. 3.15? And in Fig. 3.17?
Easy Answer

The stairways made it easier for people to reach different levels of the water structures.

They were useful when the water level changed and also allowed people to collect water, move around the structure and, in temple tanks, perform water-related rituals.

4. Which pillars are easier to sculpt in your opinion—those in Fig. 3.25 or 3.27? Justify your answer.
Easy Answer

The pillars or decorative elements made using terracotta are easier to shape than hard marble.

Terracotta can be shaped before it is fired. Marble is much harder and requires great skill, time and specialised tools for delicate carving.

Note: Both require skilled craftsmanship, but the physical process of shaping terracotta is generally easier than carving hard marble.
5. What are some common features across the different types of temples you have visited in this chapter? What are some of the differences?
Easy Answer

Common features:

  • A sacred inner space or shrine.
  • Halls or mandapas in many temples.
  • Carefully planned layouts.
  • Decorative sculpture or artwork.
  • Provision for worship and movement around sacred spaces.

Differences:

  • Different shapes of towers.
  • Different building materials.
  • Different regional styles.
  • Different types of carvings and decorations.
  • Different sizes and layouts.
6. In the houses shown in Fig. 3.46 and 3.47, the central courtyard will receive a lot of water during rains. Will this not flood the house?
Easy Answer

Normally, the courtyard would be designed with proper slopes, drains or water outlets so that rainwater could flow away or be collected.

The courtyard was therefore not simply an open hole in the house. Its design helped manage rainwater while also providing light, ventilation and cooling.

7. If you had to create a Pan-India Architecture Museum, which ten monuments would you select to represent India’s diversity and why?
One Possible Answer

I would select monuments from different periods, regions, religions and architectural traditions:

  1. Dholavira – Harappan city planning and water management.
  2. Sanchi Stupa – Buddhist stupa architecture.
  3. Ellora Caves – rock-cut Buddhist, Hindu and Jain architecture.
  4. Rani ki Vav – stepwell engineering and art.
  5. Brihadisvara Temple – grand South Indian temple architecture.
  6. Dilwara Temples – delicate Jain marble carving.
  7. Jama Masjid, Ahmedabad – Indo-Islamic architecture.
  8. Mehrangarh Fort – Rajput fort architecture.
  9. Taj Mahal – Mughal architecture and artistic synthesis.
  10. Chettinadu Houses – traditional climate-friendly house design.

Together, these examples would show India’s diversity in time, region, materials, technology, religion and artistic style.

8. Choose an ancient monument in your region. Identify what type of architecture it belongs to and the markers you used to classify it.
Sample Answer

Jageshwar Group of Temples, Uttarakhand can be taken as an example of an ancient temple complex.

I classified it as temple architecture because it has sacred shrines, stone construction, temple towers, a garbhagriha and spaces designed for worship.

The stone carvings, temple layout and religious purpose are important markers for classification.

9. Different groups in the class take up examples of different types of architecture in your region. Prepare a small exhibition with brief descriptions. (Hints: Use different sources to get more information. Request your teacher to invite a scholar or expert from your region to interact with you.)
Sample Exhibition Plan

We can divide the class into groups. Each group can study one type of architecture.

GroupArchitecture TypeWhat to Display
Group 1TemplePhoto, location, age, temple parts and special features.
Group 2Fort/PalacePlan, defensive features, materials and history.
Group 3Water StructureStepwell, tank, reservoir or traditional water system.
Group 4Traditional HouseCourtyard, climate adaptation and local materials.
Group 5Colonial/Modern HeritageArchitectural style, date and special features.

The exhibition can include photographs, drawings, maps, models and short descriptions. A local historian, archaeologist or architecture expert can also be invited.

10. Highlight the biggest threats to our architectural heritage today and discuss how can we protect it.
Easy Answer

Major threats include:

  • Pollution and environmental damage.
  • Poor maintenance and neglect.
  • Waste dumping.
  • Urbanisation and encroachment.
  • Vandalism and careless tourism.
  • Natural disasters and changing climate.
  • Loss of traditional construction and craft skills.

Ways to protect our heritage:

  • Regular inspection, repair and scientific conservation.
  • Control pollution near important monuments.
  • Prevent illegal construction and encroachment.
  • Keep monuments clean.
  • Promote responsible tourism.
  • Teach students and citizens about heritage.
  • Involve local communities and conservation organisations.
  • Use suitable traditional materials and techniques where required.
Simple conclusion: Our architectural heritage belongs to everyone. Government agencies, experts, local communities and ordinary citizens must work together to protect it.
🔎 Let’s Explore – Quick Answers & Ideas

⛰️ Rock-cut cave activity

A large cave would need careful planning. Artisans would remove rock gradually with simple tools and leave strong supporting sections. They would carefully shape the ceiling and pillars.

🛕 Temple and cosmic being

The temple can be understood as a symbolic representation of Puruṣha, the cosmic being. Its different spaces can correspond symbolically to parts of the cosmic body.

🏗️ Materials – Pros and Cons

MaterialAdvantageChallenge
BrickEasy to produce and useful for large structures.Can be damaged by water if not protected.
StoneStrong and durable.Heavy and difficult to carve.
MarbleBeautiful and suitable for detailed carving.Expensive and difficult to work with.
TerracottaCan be shaped into detailed designs before firing.Can break if not fired or maintained properly.
WoodEasy to shape and useful for interiors.Can decay or be damaged by fire and insects.

🏠 Why use a central courtyard?

  • Provides privacy.
  • Improves ventilation.
  • Allows sunlight to enter.
  • Helps cool the house.
  • Provides space for family activities.
  • Can help manage rainwater.
⚡ Quick Revision

Harappan Planned cities, drains, wells, water management.

Stupa Dome-shaped Buddhist structure.

Rock-cut Buildings carved directly into rock.

Temple Garbhagriha, mandapa, shikhara/vimana and sacred planning.

Water Architecture Wells, reservoirs, stepwells and temple tanks.

Mosque Prayer hall, mihrab, domes, minarets, arches and jalis.

Fort Defence, strategic location and royal residences.

Mausoleum Monumental tomb structure.

Traditional House Courtyard, ventilation, privacy and climate adaptation.

Indo-Saracenic Combination of Indian, Islamic and European architectural elements.

⏱️ One-Minute Exam Revision
  1. Indian architecture combines beauty, function, science and culture.
  2. Harappan cities were famous for urban planning and drainage.
  3. Dholavira was especially important for water management.
  4. Sanchi and Bharhut are important examples of stupa architecture.
  5. Ellora is famous for rock-cut Buddhist, Hindu and Jain monuments.
  6. Classical temples contain parts such as garbhagriha, mandapa, shikhara/vimana and entrances.
  7. Stepwells were used for water storage and social activities.
  8. Indo-Islamic architecture combines Islamic traditions with Indian craftsmanship.
  9. Forts were designed mainly for defence and protection.
  10. Traditional houses often use courtyards for privacy, ventilation, cooling and daily activities.
  11. Indo-Saracenic architecture combines Indian, Islamic and European influences.
  12. Heritage must be protected from pollution, neglect, vandalism, encroachment and other threats.
🌏 Final Takeaway

Indian architecture is a record of India’s long and diverse history. From Harappan drainage systems to magnificent temples, rock-cut caves, stepwells, mosques, forts, palaces, houses, churches and colonial buildings, each structure teaches us something about the people who created it.

These monuments also demonstrate engineering, mathematics, artistic skill, environmental understanding and cultural traditions.

🏛️ Remember: Protecting architectural heritage means protecting a part of our knowledge, history and cultural identity for future generations.

📚 Class 8 Social Science

A Journey Through Indian Architecture

Colourful Notes • Easy Solutions • Quick Revision

CLASS 8 • SOCIAL SCIENCE PART 2

Chapter 3 Worksheet

Practice Questions & Revision Worksheet

Open Worksheet

Class 8 Social Science Part 2 Chapter 3, Class 8 Social Science Chapter 3 Notes, A Journey Through Indian Architecture, Class 8 Social Science Part 2 Chapter 3 Notes and Book Solutions, A Journey Through Indian Architecture Notes, A Journey Through Indian Architecture Book Solutions, Class 8 Social Science Questions and Answers, Class 8 Social Science Part 2 Solutions, NCERT Class 8 Social Science, NCERT Class 8 Social Science Part 2, CBSE Class 8 Social Science, Class 8 Social Science Study Material, Class 8 Social Science Revision Notes, Class 8 Social Science Worksheets