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Landforms and Life

NCERT Class 6 · Social Science Based on NCERT Class 6 Social Science textbook · Free CBSE study kit

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Chapter Notes

Overview
This chapter explores the three major types of landforms—mountains, plateaus, and plains—and their significance to life and culture. It explains how each landform shapes the environment, climate, flora, fauna, and human activities like farming, herding, mining, and tourism. The big idea a student must walk away with is that landforms are not just physical features; they deeply influence where people live, what they do for a living, and how they connect with nature and culture.
Key Concepts (22)
Landform
A physical feature on the surface of our planet Earth that takes shape over millions of years and has a significant connection with the environment and life.
e.g. Mountains, plateaus, and plains are the three broad categories of landforms.
Mountains
Landforms that are much higher than the surrounding landscape, recognised by a broad base, steep slopes, and a narrow summit.
e.g. The Himalayas in Asia, the Alps in Europe, and the Andes in South America.
Hills
Highlands with a lower height, less steep slopes, and rounded tops compared to mountains.
e.g. The Aravalli Range in India is an example of older, rounded hills.
Altitude
The height of an object above sea level.
e.g. The altitude of Mount Everest is 8,848 metres above sea level.
Precipitation
Water from the atmosphere reaching the ground in any form—rain, snow, and hail are the most common forms.
e.g. Snow falling on high mountains is a form of precipitation.
Montane forest
A type of forest that grows in mountainous regions, where conifer trees such as pines, firs, spruce, and deodar are common.
e.g. The forests on the slopes of the Himalayas are montane forests.
Terrace farming
Cultivation practised on mountain slopes by cutting steps into the slope to create flat surfaces for farming.
e.g. In the Himalayan region of Uttarakhand, farmers grow crops on terraced fields.
Valley
A lower area between hills or mountains, often with a river or stream flowing through it.
e.g. The Kashmir Valley lies between the Pir Panjal and the Himalayan ranges.
Avalanche
The sudden fall of snow, ice, or rocks from a mountainside; often occurs when the snow starts melting.
e.g. In winter, avalanches are common in the higher reaches of the Himalayas.
Landslide
The sudden collapse of a mass of earth or rock from a mountainside.
e.g. Heavy rains in the Western Ghats often trigger landslides.
Flash flood
A sudden local flood, often caused by a cloudburst.
e.g. Cloudbursts in the Himalayan foothills can cause flash floods in rivers.
Cloudburst
A sudden violent rainstorm.
e.g. A cloudburst in Uttarakhand in 2013 led to devastating floods.
Plateau
A landform that rises up from the surrounding land and has a more or less flat surface; some of its sides are often steep slopes.
e.g. The Deccan Plateau in central and south India is one of the oldest plateaus in the world.
Plains
Landforms that have an extensive flat or gently undulating surface, generally not more than 300 metres above sea level, without any large hills or deep valleys.
e.g. The Ganga plain in northern India is a vast fertile plain.
Floodplains
A type of plain formed by rivers originating in mountain ranges, where they collect particles of rock, sand, and silt called sediments, which are deposited on the plains, making the soil very fertile.
e.g. The Indo-Gangetic plains are floodplains formed by the Indus, Ganga, and Brahmaputra rivers.
Sediments
Particles of rock, sand, and silt carried by rivers and deposited on plains.
e.g. The fertile soil of the Ganga plain is due to sediments deposited by the river.
Confluence
The meeting point of two or more rivers.
e.g. Prayagraj (Allahabad) is the confluence of the Ganga, Yamuna, and the mythical Saraswati rivers.
Sea level
The average level of the surface of the oceans, also called mean sea level.
e.g. Plains are generally not more than 300 metres above sea level.
Terrain
A piece or stretch of land, from the point of view of its physical features.
e.g. Mountain terrain is usually rugged or rough with steep slopes.
Resilience
The capacity to meet challenges and difficulties, adapt to them, or overcome them.
e.g. Humans have shown resilience by adapting to harsh conditions in deserts and mountains.
Desert
Large and dry expanses with very little precipitation, with unique flora and fauna; can be hot or cold.
e.g. The Thar Desert in Rajasthan is a hot desert; the Gobi Desert in Asia is a cold desert.
Tiṇai
A classification of five landscapes in ancient Tamil Sangam poetry, each associated with specific deities, lifestyles, moods, or emotions.
e.g. Kuriñji (mountainous regions) is associated with hunting and gathering; Marudam (fertile agricultural plains) with farming.
How It Works
Formation of floodplains
  1. Rivers originating in mountain ranges collect particles of rock, sand, and silt called sediments.
  2. These sediments are carried all the way to the plains.
  3. Rivers deposit the sediments on the plains, making the soil very fertile.
💡 Students often forget that sediments are carried from mountains, not formed in the plains themselves.
Terrace farming on mountain slopes
  1. Mountain terrain is rugged with steep slopes, making regular farming difficult.
  2. Farmers cut steps into the slope to create flat surfaces.
  3. Crops are grown on these stepped terraces.
💡 Terrace farming is done to prevent soil erosion and to make farming possible on slopes, not just for decoration.
Melting of snow on mountains feeding rivers
  1. At lower altitudes on mountains, snow melts every summer.
  2. The melted snow turns into water that feeds rivers.
  3. At high altitudes, snow may never melt, leaving the mountain permanently snow-capped.
💡 Students often think all mountain snow melts; only at lower altitudes does it melt seasonally.
Formation of plateaus through volcanic activity
  1. Volcanic activity millions of years ago led to the formation of lava plateaus.
  2. Lava plateaus often have a rich black soil.
  3. The Deccan Plateau is an example formed through volcanic activity.
💡 Not all plateaus are volcanic; some are formed by uplift or erosion, but lava plateaus have distinct fertile black soil.
Impact of irrigation on groundwater in plains
  1. Traditional agriculture in plains was mostly rainfed.
  2. In recent decades, agriculture has turned to irrigation using canals or groundwater pumping.
  3. While irrigation has increased agricultural production, it has contributed to the depletion (decrease) of groundwater.
  4. This presents a challenge for the future of agriculture in the region.
💡 Students often miss the negative consequence of irrigation—groundwater depletion—and only focus on increased production.
Exam Traps — Don't Make These Mistakes
⚠ Confusing mountains and hills
✗ Mountains and hills are the same landform.
→ Mountains have a broad base, steep slopes, and a narrow summit, while hills have lower height, less steep slopes, and rounded tops.
✓ Mountains are much higher than the surrounding landscape with steep slopes and a narrow summit; hills are lower, with less steep slopes and rounded tops.
⚠ Thinking all deserts are hot
✗ All deserts are hot and sandy.
→ Deserts can be cold, like the Gobi Desert in Asia, or even Antarctica, which is described as a desert by some experts.
✓ Deserts can be hot (e.g., Sahara, Thar) or cold (e.g., Gobi, Antarctica). They are defined by very little precipitation, not temperature.
⚠ Confusing Ganga as a tributary of Yamuna
✗ Ganga is a tributary of the Yamuna.
→ The Yamuna is a tributary of the Ganga, not the other way around. The Ganga is the main river.
✓ The Yamuna is a major tributary of the Ganga. The Ganga is the main river originating in the Himalayas.
⚠ Assuming all mountains are young and sharp
✗ All mountains have tall and sharp peaks.
→ Only relatively young mountains like the Himalayas have tall, sharp peaks. Older mountains like the Aravalli Range are shorter and more rounded due to erosion.
✓ Young mountains (e.g., Himalayas) have tall, sharp peaks; older mountains (e.g., Aravalli) are shorter and rounded by erosion.
⚠ Thinking plateaus are always fertile for farming
✗ Plateaus are very fertile and good for farming.
→ Many plateaus have rocky soil, making them less fertile than plains. Only lava plateaus have rich black soil that is fertile.
✓ Plateaus often have rocky, less fertile soil, except lava plateaus which have rich black soil. Plains are generally more fertile for farming.
Compare & Contrast
Shape and surface
Mountains
Plateaus
Mountains have a broad base, steep slopes, and a narrow summit; plateaus rise up from surrounding land with a more or less flat surface and often steep sides.
Height above sea level and fertility
Plains
Plateaus
Plains are generally not more than 300 metres above sea level and are very fertile due to sediment deposition; plateaus can be several thousand metres high and often have rocky, less fertile soil (except lava plateaus).
Age and shape
Young mountains (e.g., Himalayas)
Old mountains (e.g., Aravalli)
Young mountains are tall with sharp peaks and are still growing in height; old mountains are shorter, more rounded, and have been worn down by erosion over millions of years.
Exam Focus
Marks pattern: 2 MCQs (1 mark each), 1 SA (3 marks) on characteristics of landforms, 1 LA (5 marks) on life in a specific landform or compare-contrast of two landforms
Most asked: Types of landforms (mountains, plateaus, plains) and their characteristics · Life in mountains: terrace farming, tourism, challenges (avalanches, landslides, etc.) · Life in plains: agriculture, river navigation, cultural significance of rivers · Plateaus as storehouses of minerals · Differences between young and old mountains
Don't skip: Describe the three major landforms and give one example of each from India.; Explain how terrace farming is done in mountains and why it is necessary.; Why are plains densely populated? Give reasons based on the chapter.; Compare and contrast mountains and plateaus.
One-Line Revision (read aloud before the exam)
  1. Landforms are physical features on Earth's surface that take shape over millions of years and are classified into mountains, plateaus, and plains.
  2. Mountains have a broad base, steep slopes, and a narrow summit; hills are lower with rounded tops.
  3. Altitude is the height of an object above sea level.
  4. Precipitation includes rain, snow, and hail—water from the atmosphere reaching the ground.
  5. Montane forests grow on mountain slopes and have conifer trees like pines, firs, spruce, and deodar.
  6. Terrace farming is cutting steps into mountain slopes to grow crops.
  7. Avalanches, landslides, flash floods, and cloudbursts are challenges faced by people living in mountains.
  8. Plateaus rise up from surrounding land with a flat surface and steep sides; they are called 'storehouses of minerals'.
  9. The Deccan Plateau is one of the oldest plateaus in the world, formed by volcanic activity.
  10. Plains are flat or gently undulating land, generally below 300 metres above sea level, and are very fertile.
  11. Floodplains are formed by rivers depositing sediments carried from mountains.
  12. The Ganga plain is home to about 40 crore people, more than one-fourth of India's population.
  13. Irrigation has increased agricultural production but also led to groundwater depletion.
  14. Confluence is the meeting point of two or more rivers, often considered sacred in Indian culture.
  15. Deserts are dry expanses with very little precipitation; they can be hot (Thar) or cold (Gobi).
  16. The five tiṇais of Sangam poetry classify landscapes into mountainous, grassland, fertile plains, coastal, and arid regions.
  17. Young mountains like the Himalayas have sharp peaks and are still growing; old mountains like the Aravalli are rounded by erosion.

MCQs — 10 Questions with Answers

Q1. Which of these is NOT one of the three main types of landforms?

  • A. Mountains
  • B. Plateaus
  • C. Deserts ✓
  • D. Plains

Answer: C — The three main landforms are mountains, plateaus, and plains; deserts are a type of region but not a main landform category.

Q2. What does the term 'altitude' mean?

  • A. The distance from East to West
  • B. The height of an object above sea level ✓
  • C. The width of a mountain
  • D. The temperature at a place

Answer: B — Altitude specifically refers to the height or elevation of something measured from sea level.

Q3. Which of the following is the highest mountain in South India?

  • A. Mount Kilimanjaro
  • B. Anamudi ✓
  • C. Mount Everest
  • D. Mont Blanc

Answer: B — Anamudi (also called Anai Peak) in Kerala is the highest mountain in South India.

Q4. Himalayan mountains are called 'young' mountains because ________.

  • A. They were formed recently in Earth's history and still have sharp peaks ✓
  • B. They have many young trees growing on them
  • C. They are smaller than other mountains
  • D. They have rounded tops

Answer: A — Young mountains like the Himalayas were formed more recently (still millions of years ago) in Earth's history, have sharp peaks, and are still growing today.

Q5. What type of trees grow in montane forests?

  • A. Mango and neem trees
  • B. Conifer trees like pines, firs, and spruce ✓
  • C. Coconut and palm trees
  • D. Only grass and mosses

Answer: B — Montane forests on mountain slopes are characterized by conifer trees such as pines, firs, spruce, and deodar with their distinctive tall, cone shape and thin pointed leaves.

Q6. Look at this diagram showing three landforms. Which one is the plateau?

  • A. The tallest one with sharp peaks on the left
  • B. The flat raised area in the middle ✓
  • C. The lowest flat area on the right
  • D. The sloped area at the bottom

Answer: B — A plateau is a raised, relatively flat area of land higher than the surrounding plains but flatter on top than a mountain.

Q7. Why is snow important in the Himalayan mountains? Because it ________.

  • A. Makes the landscape look beautiful
  • B. Melts in summer and feeds rivers like the Ganga ✓
  • C. Prevents trees from growing
  • D. Keeps the mountains cold all year

Answer: B — Mountain snow at lower altitudes melts during summer and provides water that feeds major rivers like the Ganga, which millions of people depend on.

Q8. Which river originates in the Himalayas and is nearly 2,500 km long?

  • A. Ganga ✓
  • B. Brahmaputra
  • C. Godavari
  • D. Narmada

Answer: A — The Ganga river originates in the Himalayas and is nearly 2,500 km long with many tributaries joining it.

Q9. How are old mountains like the Aravalli Range different from young mountains like the Himalayas?

  • A. Old mountains are taller and sharper
  • B. Old mountains have rounded peaks because they have been shaped by erosion over time ✓
  • C. Old mountains have more snow
  • D. Old mountains have no animals living in them

Answer: B — Older mountains like the Aravalli have been rounded by erosion over millions of years, while young mountains like the Himalayas still have sharp peaks.

Q10. What is the main difference between a mountain and a hill?

  • A. Mountains have trees and hills do not
  • B. Mountains are much higher, have steeper slopes and narrower summits, while hills are lower with less steep slopes and rounded tops ✓
  • C. Hills are found only in the north and mountains in the south
  • D. There is no difference between mountains and hills

Answer: B — Mountains are significantly higher landforms with steep slopes and narrow summits, while hills are lower with gentler slopes and more rounded tops.

Flashcards

What is a landform?

A landform is a physical feature on the Earth's surface like mountains, plateaus, or plains that takes millions of years to form.

Name the three main types of landforms.

The three main landforms are mountains, plateaus, and plains.

What does altitude mean?

Altitude is the height of an object or place above sea level.

What is a montane forest?

A montane forest is a type of forest that grows in mountainous regions with cone-shaped trees like pines, firs, and spruce.

Why are Himalayan mountains called 'young' mountains?

Himalayan mountains are called young because they were formed recently in Earth's history (still millions of years ago) and still have sharp peaks and are still growing.

Which Indian mountain is the highest in South India?

Anamudi (also called Anai Peak) in Kerala is the highest mountain in South India.

What are conifer trees and where do they grow?

Conifer trees are tall, cone-shaped trees with thin pointed leaves (like pines, firs, and deodars) that grow on mountain slopes in montane forests.

How long is the Ganga river?

The Ganga river is nearly 2,500 kilometres long and originates from the Himalayas.

What is the difference between a mountain and a hill?

Mountains are much higher than hills, have steeper slopes and narrower summits, while hills are lower with less steep slopes and more rounded tops.

What is precipitation?

Precipitation is water from the atmosphere reaching the ground in any form, including rain, snow, and hail.

Important Board Questions

What is a landform? Give one example. [1 mark]

A landform is a physical feature on Earth's surface; example: mountains, plateaus, or plains. Just name one.

Fill in the blanks: The three main types of landforms are ________, ________, and ________. [1 mark]

The three categories mentioned in the chapter are mountains, plateaus, and plains.

Explain in 2-3 sentences why snow in the Himalayan mountains is important for people living in India. [2 marks]

Snow at high altitude melts in summer and feeds rivers; mention the Ganga river and that people depend on this water.

What is a montane forest? Name any two types of trees found in montane forests and describe their appearance. [2 marks]

Montane forest = mountain forest with specific trees; describe conifer trees as tall, cone-shaped with thin pointed leaves (examples: pine, fir, spruce, deodar).

Describe the main features of mountains. Why are Himalayan mountains called 'young' mountains? Explain with one example of an old mountain. [3 marks]

Mountains have: broad base, steep slopes, narrow summit. Young mountains = recently formed, sharp peaks, still growing (Himalayas still grow). Old mountains = rounded by erosion (Aravalli Range example).

Imagine you are travelling from Chhota Nagpur in Jharkhand to Almora in Uttarakhand. Describe the different landscapes you would see on this journey and explain how each landscape (mountain, plateau, plain) affects the life of people living there. [5 marks]

You will pass three landforms: identify each one; for each, describe climate, vegetation, animals, and how people adapt (homes, jobs, food, transport). Use examples like montane forests with conifers in mountains, different animals in each region, how rivers from mountains help plains.

Assertion-Reason Questions for Landforms and Life

Q1. Assertion (A):

Mount Everest is the highest mountain in the world.

Reason (R):

It is located between Tibet and Nepal in the Himalayan range.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both statements are true, and the reason correctly explains why Mount Everest is the highest — it is in the Himalayas, which contain the world's tallest peaks.

Q2. Assertion (A):

The Aravalli Range is older than the Himalayan Range.

Reason (R):

The Aravalli mountains have rounded peaks while the Himalayas have sharp peaks.

Answer: A — Both A and R are true, and R is the correct explanation of A — Both are true. Rounded peaks are a sign of age because erosion has worn them down over millions of years, so the Aravalli being more rounded proves it is older.

Q3. Assertion (A):

Montane forests are found in plains areas of India.

Reason (R):

Montane forests grow in mountainous regions with conifer trees like pines and deodars.

Answer: D — A is false but R is true — The assertion is false because montane forests are found in mountains, not plains. The reason is true but contradicts the assertion, so both cannot be right.

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Case-Based Questions (CBQ) for Landforms and Life

Case Study:

Ravi lives in a village near the Himalayas in Himachal Pradesh. During winter, heavy snow falls in the mountains above his village. In spring, as the weather warms up, the snow melts and turns into water. This water feeds the small rivers that flow through his village and provide water for farming and drinking.

Q1. What happens to the snow that falls in the mountains above Ravi's village?

  • A. It stays on the mountains forever
  • B. It melts in spring and becomes water that feeds rivers ✓
  • C. It turns into ice permanently
  • D. It disappears into the sky

Answer: B

Q2. Why are rivers important to Ravi's village?

  • A. They are beautiful to look at
  • B. They provide water for farming and drinking ✓
  • C. They are home to fish only
  • D. They prevent snow from falling

Answer: B

Q3. Which type of landform is the area where Ravi lives?

  • A. A plain
  • B. A plateau
  • C. Mountains ✓
  • D. An ocean

Answer: C

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