CLASS 6 SOCIAL SCIENCE · CHAPTER 3 · STUDY NOTES
Landforms and Life
Read mountains, plateaus and plains through their shapes, water, living things and people’s choices.
01 / EXPLORE & UNDERSTAND
Three landforms: look at shape and height
A mountain, a plateau and a plain can all have people, plants and rivers. Their land shapes differ.
Find three shapes in one landscape
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1. Compare with the surrounding land
A mountain rises high above its surroundings and usually has steep slopes. A plateau is also raised, but has a broad, fairly flat top. A plain spreads over a wide, flat or gently rolling area. A flat top alone does not make a plateau a plain: notice its raised edges too.
2. Follow the chapter’s journey
Travel from Chhota Nagpur in Jharkhand to Prayagraj and then Almora. You move from a plateau region to the Ganga plain and then into mountains. These categories help us compare places; a real landscape may contain smaller hills, valleys and rivers within it.
Your turn
Question
A wide flat surface has steep sides above the surrounding land. Why might it be a plateau rather than a plain?
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02 / EXPLORE & UNDERSTAND
Altitude begins at sea level
“High” needs a starting point. Altitude uses average sea level as that reference.
Compare using the shared height scale
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1. Keep the reference the same
When comparing mountain altitudes, start both measurements at sea level. A photograph can mislead: a nearby smaller mountain may look taller than a distant one. The book’s height sketch uses one scale to compare mountains that are far apart in real life.
2. Place the examples on the world map
The Himalayas are in Asia, the Alps in Europe and the Andes in South America. Aconcagua belongs to the Andes; Mont Blanc to the Alps. Kilimanjaro in eastern Africa is an isolated mountain. Anamudi is in Kerala. A mountain range is a group of connected mountains, not one summit.
Your turn
Question
Can two mountain photographs taken from different distances reliably tell you which mountain has the greater altitude?
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03 / EXPLORE & UNDERSTAND
Mountains change over a very long time
“Young mountain” still means millions of years old—not a mountain made last week.
1. Compare uplift with wearing down
The Himalayas are relatively young in Earth’s history. The much older Aravalli hills have been worn down over a long time. Uplift can raise land while erosion removes material. Both processes can act in the same region; shape is a clue, not a complete age test by itself.
2. Follow mountain water
At cold high places, precipitation may fall as snow. Some snow remains; some melts and feeds streams and rivers. Rain also supplies rivers. Not every mountain is snow-covered, and a river need not depend only on melting snow.
Your turn
Question
Can erosion continue while a mountain region is being uplifted? Explain.
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04 / EXPLORE & UNDERSTAND
Mountain habitats change with height
Different temperatures, slopes and water conditions support different living things.
1. Read the vegetation pattern
In many mountain regions, pines, firs, spruce and deodar grow on slopes. At higher, colder places, trees may give way to grasses, mosses and lichens. This is a broad pattern: rainfall, location and local conditions also matter. Not every mountain has the same forest.
2. Do not put every animal on one mountain
The book shows mountain animals from different regions: yak, ibex, Himalayan tahr, eagles and Canadian lynx, among others. The collection shows variety, not a claim that all live together. Mountains contain forests, grasslands, rivers and rocky habitats, each offering different food and shelter.
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Question
Why should a picture collection of mountain animals not be read as one local food web?
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05 / EXPLORE & UNDERSTAND
People adapt work to mountain slopes
A steep slope is difficult to farm like a large level field. Terraces create smaller level strips.
Look for the narrow level strips
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1. Notice the steps in the photograph
Terrace edges run across a hillside. Each strip gives crops a more level surface than the original slope. Building and maintaining terraces needs skill and work. Valleys can also offer farmland. The land shape affects farming choices but does not make every mountain farmer use the same method.
2. See more than one livelihood
Herding, farming, local trade and tourism can support mountain communities. Visitors may come for scenery, trekking or pilgrimage. The same place can be a home, workplace and sacred site—not just a holiday destination.
Your turn
Question
How does a terrace change a slope for farming without turning the whole mountain into a plain?
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06 / EXPLORE & UNDERSTAND
Mountain opportunities come with challenges
Discuss both what supports life and what makes daily life difficult.
When a slope fails beside a road
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1. Distinguish the hazards
A landslide moves rock and soil down a slope. An avalanche moves a mass of snow, sometimes mixed with ice and rock. A flash flood is a rapid flood; intense rain can be one cause. These events are different, even though several may affect the same mountain region.
2. Connect visitor choices with local needs
Tourism can create income, but crowded roads, waste and heavy water use put pressure on a place. Better transport planning, careful building, waste collection and respect for local guidance help. People remain in mountains for their homes, work, community and culture—not because challenges do not exist.
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Question
A town wants more visitors. Why should its plan include water and waste services as well as hotels?
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07 / EXPLORE & UNDERSTAND
A plateau is a raised broad surface
Plateaus can differ greatly in height, climate, soil and resources.
1. Compare real examples
The Tibetan Plateau is very high; its average altitude is about 4,500 metres. The Deccan Plateau covers a large part of central and southern India. Chhota Nagpur is another plateau region. Do not assume a plateau must be low just because its top looks flat.
2. Connect rocks, soil and work carefully
Chhota Nagpur has important coal, iron and manganese deposits, supporting mining and related work. Some plateau soils are rocky; some lava regions have useful black soil. Parts of the Deccan were formed by ancient lava flows. Plateaus are not all alike, and mining can bring environmental costs as well as jobs.
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Question
Why is “no farming can happen on plateaus” an unreliable rule?
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08 / EXPLORE & UNDERSTAND
Water can fall over a steep land edge
A waterfall makes a sudden drop in a river’s course visible.
Read the drop at Nohkalikai Falls
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1. Read the book photograph
Nohkalikai Falls drops from the Cherrapunji Plateau in Meghalaya. Find the high land, the falling water and the lower pool in the picture. The photograph helps show the drop, but is not a scale drawing from which to measure its exact height.
2. Link names to rivers and regions
The chapter also gives Hundru Falls on the Subarnarekha and Jog Falls on the Sharavati as examples. Victoria Falls is on the Zambezi in southern Africa. Use these examples to notice a land-and-water connection, rather than memorising a picture as the only possible shape of a waterfall.
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Question
Which three parts would you point out to explain a waterfall photograph to a friend?
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09 / EXPLORE & UNDERSTAND
Rivers help build floodplains
A plain may look still, but rivers can keep moving and depositing material across it.
A wide plain beside a mountain belt
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1. Follow material downstream
Flowing water can pick up loose material, carry it and deposit it farther along. During floods, water may spread over nearby land and leave sediment as it slows. Over time this helps build floodplains. Not every plain forms in exactly this way.
2. Connect soil with farming—not a guarantee
River deposits can make fertile soils, supporting farming in places such as the Ganga plain. Crop growth also needs suitable water, climate and care. A river that supports crops can also flood fields and homes; benefits and risks belong in the same explanation.
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Question
Why can the same river be valuable to farmers and also create a flood risk?
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10 / EXPLORE & UNDERSTAND
Plains support many kinds of work
Level land, water and transport links help explain why many settlements grow on plains.
The river is also a route
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1. Connect farming and water supply
The Ganga plain supports food crops such as rice and wheat, as well as fibre crops in suitable areas. Rainfed farming depends mainly on rain. Irrigation can provide extra water, but pumping groundwater faster than it is replenished lowers the available supply. More pumping is not an unlimited solution.
2. Include movement and river care
Fishing, boat transport, trade and other work connect people with rivers. Gentle slopes can support navigation, but boats still need suitable depth and safe conditions. Pollution affects people and river life. A confluence is where rivers meet, such as the Yamuna and Ganga at Prayagraj.
Your turn
Question
A canal supplies crops, while nearby wells fall lower each year. What should a water plan consider?
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11 / EXPLORE & UNDERSTAND
A desert is dry, not always hot
Low precipitation is the key idea. Temperature can be very different between deserts.
1. Separate dryness from heat
The Sahara and Thar are hot-desert examples. The Gobi is a cold-desert example, and Antarctica is also extremely dry. A place does not stop being a desert just because it is cold. Precipitation includes rain and snow, not rain alone.
2. Recognise life and culture
Deserts support plants, animals and communities adapted to scarce water and demanding conditions. Communities in and around the Thar have rich songs, stories and traditions. Avoid describing a desert as empty or lifeless: low rainfall changes how life is organised, not whether any life exists.
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Question
A cold place receives very little snow or rain. Could it be a desert?
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12 / EXPLORE & UNDERSTAND
Landscapes shape culture as well as work
People describe, celebrate and care about the places where they live.
1. Read poetry as poetry
The chapter includes a hymn about Earth and Kalidasa’s poetry about the Himalayas. These express relationships with nature; they are not measurements or satellite maps. Mountains such as Kailash and river confluences are sacred to different communities. Respectful explanation names the belief without claiming everyone shares it.
2. Use the five tinai as a way of seeing connections
Ancient Tamil Sangam poetry linked landscapes with ways of life: Kurinji with mountains, Mullai with forests and grasslands, Marudam with farming plains, Neydal with coasts and Palai with dry regions. This is a cultural classification, not the same three-part physical classification. The main lesson is the link between land and human life, not memorising every name.
Your turn
Question
Why can a mountain be described as a physical landform and a sacred place without those descriptions being the same kind of information?
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Sign inNew here? Sign up freeCHAPTER RECAP
Take these ideas with you
- Compare the height and shape of land with its surroundings.
- Altitude uses average sea level as a common reference.
- Mountain farming, tourism and herding adapt to slopes and local conditions.
- Plateaus are raised broad surfaces; soils and mineral resources vary.
- Rivers carry sediment, supply water and can also cause floods.
- Land affects work and culture, but people’s choices and conditions also matter.
Use your understanding in a new situation
Question
Compare a plateau farmer and a plain farmer without assuming one always has better soil.
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Sign inNew here? Sign up freeQuestion
Explain one opportunity and one challenge for a mountain town welcoming tourists.
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Sign inNew here? Sign up freeNCERT · Chapter source PDF, pages 1, 6, 9, 11, 15, 17, 18 · Original Learnijoy explanations and practice.