Landforms of the Continents and Environmental Issues: Class 8 World Geography Notes
Updated 17 October 2026 · Fact-checked
Class 8 NCERT tours one or two landforms per continent: the Tibetan Plateau, Gobi and Eurasian Steppes and Urals in Asia; the European Plain and Alps; the Sahara and the Nile in Africa; the Andes, Amazon and Atacama in South America; the Colorado Plateau, Rockies and Great Lakes in North America; and the deserts of Australia. Human actions such as deforestation and pollution threaten these systems.
Compare the shapes: plains are low and flat, plateaus are raised with a flat top, mountains have a broad base and narrow summit, deserts are dry.
Illustration drawn for QuestionBuddy.
Understand Landforms of the Continents and Environmental Issues
Landforms. Mountains rise much higher than the surrounding land (broad base, steep slopes, narrow summit); a plateau rises from the surroundings with a more or less flat surface; plains are extensive flat or gently undulating surfaces. A desert is a large dry expanse with low precipitation (less than 25 cm a year), found on every continent covering about one-fifth of the Earth's land; some are hot (Sahara, Thar), some cold (Gobi). A continent is a large continuous expanse of land; the common count is seven. Mountains are formed by tectonic forces, volcanic activity and erosion and act as 'water towers', climate influencers, biodiversity hotspots and natural boundaries.
Asia.
- Tibetan Plateau: the highest and largest plateau on Earth, north of the Himalayas, formed by the collision of the Indo-Australian and Eurasian plates, about 2,500 km east-west and 1,000 km north-south, average height over 4,500 metres. Source of rivers such as the Indus, Brahmaputra and Yangtze. Called the 'Third Pole' (largest freshwater reserves outside the polar regions); snow-melt has enlarged lakes and made new ones.
- Gobi Desert (Mongolia and north China), 'Land of the Eternal Blue Sky' with 8 to 9 months of sunshine; winters may fall to minus 30 degrees C; herds migrate seasonally.
- Eurasian Steppes: flat unforested grassland over 8,000 km, a global carbon sink and a resting place for migratory birds such as the Siberian crane. Nomads live in yurts.
- Ural Mountains: about 2,500 km, from the Arctic Ocean to Kazakhstan's border; natural boundary between Europe and Asia; rich in iron ore, copper, zinc, platinum, gold, coal, oil and natural gas; taiga forests, tundra, swamps. In the tundra, frozen soil (permafrost) traps carbon dioxide and methane, and melting releases them, speeding climate change.
Europe. The European Plain is one of the largest flatlands, with fertile soil (wheat, barley, rye, potatoes), rivers for trade, and cities such as Moscow, Berlin, Paris, Amsterdam and Warsaw. The Alps are a crescent-shaped range about 1,200 km long, with peaks such as Mont Blanc, a source of water to rivers like the Rhine and tributaries of the Danube, used for drinking water, irrigation and hydroelectric power.
Africa. The Sahara, the largest hot desert (temperatures 30 to 46 degrees C, rainfall under 25 cm), has oases, nomadic herders and ancient trade routes carrying gold, salt and ideas. The Nile, almost 6,650 km, the longest river, was the cradle of ancient Egyptian civilisation, giving irrigation, drinking water, fishing, hydroelectric power and transport. The savannah is tropical grassland with scattered trees and wet and dry seasons, supporting elephants, lions, zebras and giraffes, threatened by farming, deforestation and climate change.
South America. The Andes are the continent's largest range with Mount Aconcagua (highest peak in the Western Hemisphere) and the Uyuni Salt Flats (largest on Earth); a source of fresh water for rivers including the Amazon (largest river by volume), with copper, zinc, silver and lithium; only about one-fourth of original flora and fauna remains, so a conservation hotspot. The Amazon flows from the Andes in Peru east to the Atlantic; almost 400 indigenous communities live in the rainforest, which is threatened by deforestation and climate change. The Atacama Desert in Chile (about 1,000 km) is among the driest places, with 40 degrees C by day and 5 degrees C by night; it has become a dump for discarded fast-fashion clothes.
North America. The Colorado Plateau (over 330,000 sq km, with the Grand Canyon, about 5 million visitors annually); the Rocky Mountains (over 4,800 km, copper, gold, silver; Yellowstone's wolves restored ecological balance after 1995); the Appalachians, among the oldest ranges; and the five Great Lakes, vital for shipping and drinking water but affected by chemical contamination and agricultural run-off.
Australia. A large part is desert (the Great Australian Desert, including the Great Victoria Desert), with animals such as dingoes and bilbies. Antarctica is the largest desert on Earth, over 14 million square kilometres and the coldest.
Human impact. Deforestation, overuse of resources and pollution cause desertification, biodiversity loss and climate change. Studying world geography helps manage the Earth wisely for sustainable development.
Landforms of the Continents and Environmental Issues: key facts
- Tibetan Plateau (NCERT figures)
- About 2,500 km east-west
- 1,000 km north-south
- average height over 4,500 m
- source of Indus, Brahmaputra, Yangtze
- Called the Third Pole.
- Desert definition
- Large dry area
- rainfall less than 25 cm a year
- about one-fifth of Earth's land
- on every continent
- Hot and cold deserts.
- Ranges and their lengths
- Urals about 2,500 km
- Alps about 1,200 km
- Rockies over 4,800 km
- Check each.
- Rivers
- Nile: almost 6,650 km, longest river | Amazon: largest by volume, from the Andes to the Atlantic
- Two great rivers.
- Continents and one feature
Asia Tibetan Plateau Europe European Plain, Alps Africa Sahara, Nile South America Andes, Amazon, Atacama North America Rockies, Great Lakes Australia Great Australian Desert - Map revision list.
How to answer Landforms of the Continents and Environmental Issues questions
Questions ask for a feature's location, formation, importance and threats; match features with continents; or compare two landforms.
- 1Write feature, continent, one fact on location and size, one on resources or people.
- 2For formation, name the process: tectonic collision, erosion or deposition.
- 3For threats, name a human action and its effect.
- 4For comparison, use columns: continent, landform type, climate, uses.
- 5Quote NCERT numbers in the same form (for example 'over 4,500 metres').
Landforms of the Continents and Environmental Issues in real life
The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.
Why mountains matter to people far away
Suppose a town on a plain draws water from a river that begins as snow-melt on a high mountain range hundreds of kilometres away. Over the years the mountain snow cover slowly shrinks.
Explain using the idea of 'water towers' what could happen to the town.
Try it first, then show the solutionSolution
- Mountains store water as snow and glaciers.
- Melting feeds rivers.
- If snow cover shrinks, river flow can become less reliable.
Answer: Mountains act as water towers by releasing fresh water through melting snow and glaciers. If the snow cover shrinks, the river may become less dependable and the town's water security could be at risk.
Memory hook: High snow feeds low towns.
Tricks to remember Landforms of the Continents and Environmental Issues
Short memory aids. Say each one aloud once, then use it on a question the same day.
Third Pole
Tibetan Plateau = Third Pole: freshwater reserves outside the polar regions.
Use it when: Why the Tibetan Plateau is unique.
AAA
Andes, Amazon, Atacama: South America's three headline features.
Use it when: South America.
Rivers by record
Nile = longest; Amazon = largest by volume.
Use it when: Two world records.
Landforms of the Continents and Environmental Issues: solved examples
Ordered from board level to HOTS. Try each one before you open the solution.
Example 1: Which desert is cold? · 1 mark · MCQBoard level
Which of the following is a cold desert?
(a) Sahara
(b) Thar
(c) Gobi
(d) Atacama
Try it first, then show the solutionSolution
- NCERT names the Gobi as a cold desert; the Sahara and Thar are hot (1 mark).
Answer: (c) Gobi
Example 2: The Tibetan Plateau (3 marks) · 3 marks · Short answerHarder board level
Why is the Tibetan Plateau called the 'Third Pole' and the 'Roof of the World'? Name two rivers that begin there. (3 marks)
Try it first, then show the solutionSolution
- It is the highest and largest plateau, with average height over 4,500 metres (1 mark).
- It holds the largest freshwater reserves outside the polar regions (1 mark).
- Rivers: any two of Indus, Brahmaputra, Yangtze (1 mark).
Answer: The Tibetan Plateau is the highest and largest plateau on Earth, with an average height of over 4,500 metres, hence the 'Roof of the World'. Scientists call it the 'Third Pole' because it contains the largest reserves of freshwater outside the polar regions. Major rivers such as the Indus and Brahmaputra (and the Yangtze) originate there.
Example 3: Assertion-reason: permafrost · 1 mark · Assertion-reasonHarder board level
Assertion (A): Melting permafrost in the tundra can speed up climate change.
Reason (R): Frozen tundra soil traps greenhouse gases such as carbon dioxide and methane, which are released when it melts.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Try it first, then show the solutionSolution
- NCERT explains that released gases speed up climate change (1 mark).
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Example 4: Compare Sahara and Atacama (5 marks) · 5 marks · Long answerHarder board level
Compare the Sahara and the Atacama deserts in terms of location, climate, human or animal life and one concern. (5 marks)
Try it first, then show the solutionSolution
- Location: Sahara in Africa, largest hot desert; Atacama in Chile, about 1,000 km, one of the driest places (1 mark).
- Climate: Sahara temperatures 30 to 46 degrees C, rainfall under 25 cm; Atacama 40 degrees C by day to 5 degrees C by night (1 mark).
- Life: Sahara nomads with sheep, goats, camels, oases, date palms, fennec fox; Atacama clear skies for stargazing (1 mark).
- Concerns: Sahara needs adaptation to heat of over 50 degrees C by plants and animals (1 mark).
- Atacama has become a dump for discarded fast-fashion clothes (1 mark).
Answer: The Sahara in Africa is the largest hot desert; temperatures range from 30 to 46 degrees C (sometimes upward of 50 degrees C) and rainfall is under 25 cm. It supports nomads who herd sheep, goats and camels, oases with date palms, and adapted animals like the fennec fox, and ancient trade routes passed through it. The Atacama in Chile stretches about 1,000 km and is among the driest places on Earth, with 40 degrees C by day and 5 degrees C at night; it is known for clear night skies. A concern in the Atacama is that it has become a dumping ground for discarded fast-fashion clothes, called an environmental and social emergency by the UN.
Example 5: Case: Yellowstone's wolves · 4 marks · Case-basedHOTS / competency
Read the case and answer.
NCERT states that Yellowstone National Park, in the Rocky Mountains, had an ecological imbalance because elk, a type of deer, were overgrazing. In 1995 wolves were introduced; they hunted the elk, reducing their population and allowing plants to return, restoring ecological balance.
(i) What caused the imbalance? (1)
(ii) What was the step taken in 1995? (1)
(iii) Explain how the return of wolves helped plants and what this teaches about ecosystems. (2)
Try it first, then show the solutionSolution
- (i) Overgrazing by elk (1 mark).
- (ii) Wolves were introduced (1 mark).
- (iii) Fewer elk meant less grazing, so plants returned; ecosystems depend on connected species and restoring one link can restore balance (2 marks).
Answer: (i) Overgrazing by a large number of elk. (ii) Wolves were introduced in 1995. (iii) The wolves hunted the elk and reduced their numbers, so plants could grow back, restoring ecological balance. It shows that the species in an ecosystem are interconnected and that restoring a missing predator can heal the whole system.
Where students lose marks in Landforms of the Continents and Environmental Issues
The slips examiners see most often, and what to write instead.
Mistake: Calling the Gobi a hot desert
All deserts assumed hot.
Wrong working
The Gobi is a hot desert in Asia.
Right working
The Gobi is a cold desert; winters can fall to minus 30 degrees C.
Do this: Learn hot: Sahara, Thar; cold: Gobi, Antarctica.
Usually costs: 1 mark.
Mistake: Mixing records of rivers
Both are famous.
Wrong working
The Amazon is the longest river.
Right working
The Nile is the longest (almost 6,650 km); the Amazon is the largest by volume.
Do this: Longest = Nile; largest = Amazon.
Usually costs: 1 mark.
Mistake: Placing features on wrong continents
No map practice.
Wrong working
The Urals are in North America.
Right working
The Urals form the boundary between Europe and Asia.
Do this: Revise with the physical map of each continent.
Usually costs: 1 mark.
Exam tips
- Keep a one-line card for each feature: continent, size, resource, threat.
- Add a human-impact sentence to every geography answer; the chapter ends with this theme.
- In map-based questions, use the colour key: blue water, green plains, yellow/brown plateaus, dark brown mountains.
- Use 'about' with approximate NCERT figures.
Practice questions on Landforms of the Continents and Environmental Issues
Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.
Q1 · 1 mark · MCQBoard level
The longest river in the world, as per NCERT, is the:
(a) Amazon
(b) Nile
(c) Yangtze
(d) RhineHint
Cradle of ancient Egyptian civilisation.
Answer
(b) Nile
Q2 · 2 marks · Very short answerBoard level
What is a steppe? Why is it called a carbon sink? (2 marks)
Hint
Grassland.
Answer
A steppe is a large area of flat, unforested grassland with a temperate climate, hot summers, cold winters and moderate seasonal rain. It is a global carbon sink because the grassland absorbs carbon from the air and stores it underground, which helps reduce greenhouse effects over time.
Q3 · 3 marks · Short answerHarder board level
Describe the importance of the Andes mountains. (3 marks)
Hint
Water, minerals, biodiversity.
Answer
The Andes, the largest range in South America, include Mount Aconcagua and the Uyuni Salt Flats. They supply freshwater to millions of people by feeding rivers including the Amazon. They are rich in biodiversity, though only about one-fourth of the original flora and fauna remains, making them a conservation hotspot, and hold vast reserves of copper, zinc, silver and lithium.
Q4 · 1 mark · Assertion-reasonHarder board level
Assertion (A): The Andes are described as a critical conservation hotspot.
Reason (R): Only about one-fourth of the original flora and fauna of the Andes remains.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.Hint
What is a conservation hotspot?
Answer
(a) Both A and R are true, and R is the correct explanation of A.
Q5 · 5 marks · Long answerHOTS / competency
Choose one environmental issue from the chapter: deforestation of the Amazon, bleaching of coral reefs or desertification. Explain its causes, impacts and two possible solutions. (5 marks)
Hint
Causes, consequences, solutions; use NCERT facts.
Answer
Taking the deforestation of the Amazon: the rainforest is cleared as countries need land for development, and climate change adds stress. The Amazon basin supports a rainforest where almost 400 indigenous communities live and which has rich biodiversity; losing it harms these communities, reduces biodiversity and weakens its role as the 'Lungs of the Earth'. It also removes a forest that depends on, for instance, phosphorus carried as dust from the Sahara. Solutions: protect the forest with the involvement of indigenous communities who help conserve it, and balance development with conservation by planning land use, restoration and reducing the demand that drives clearing.
Test your recall
Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.
1.What is the Third Pole?Show answer
The Tibetan Plateau and its mountains, which hold the largest freshwater reserves outside the polar regions.
2.Which range forms a natural boundary between Europe and Asia?Show answer
The Ural Mountains.
3.Which is the largest hot desert in the world?Show answer
The Sahara.
4.Where is the Atacama Desert?Show answer
In Chile, South America.
5.Which is the largest desert on Earth?Show answer
Antarctica, over 14 million square kilometres.
Landforms of the Continents and Environmental Issues: frequently asked questions
What makes the Tibetan Plateau unique?
It is the highest and largest plateau on Earth, the source of major rivers and the largest freshwater store outside the polar regions.
How do mountains help human life?
They influence climate, supply water as 'water towers', hold biodiversity and minerals, and often act as natural boundaries.
What is a savannah?
A tropical grassland with scattered trees and distinct wet and dry seasons, lying mainly between tropical rainforests and deserts, as in Africa.