CBSE Class 6 General Knowledge

Unit 3: World Geography

Lesson: Major Mountains, Rivers, and Deserts

📘 Study Module: Major Mountains, Rivers, and Deserts

1. Introduction

Mountains, rivers, and deserts are major physical features of the Earth. They play an important role in shaping climate, natural vegetation, wildlife, and human life. Studying these features helps us understand the natural environment of different regions of the world.

2. Major Mountain Ranges of the World

Mountains are high landforms rising steeply above the surrounding areas. Some of the major mountain ranges of the world include:

• The Himalayas
• The Andes
• The Alps
• The Rocky Mountains
• The Atlas Mountains

Mountains influence climate, rainfall, and river systems.

3. Major Rivers of the World

Rivers are natural streams of flowing water that usually begin in mountains and flow into seas or oceans. Important rivers of the world include:

• The Nile
• The Amazon
• The Ganga
• The Yangtze
• The Mississippi

Rivers provide water for drinking, agriculture, and transportation.

4. Major Deserts of the World

Deserts are dry regions that receive very little rainfall. Some major deserts of the world are:

• Sahara Desert
• Thar Desert
• Gobi Desert
• Kalahari Desert
• Atacama Desert

Deserts have extreme climatic conditions and sparse vegetation.

5. Importance of Mountains, Rivers, and Deserts

• Mountains act as natural barriers and sources of rivers.
• Rivers support agriculture, settlements, and trade.
• Deserts influence climate and have unique plant and animal life.

📝 Questions and Answers

A. Short Answer Questions

(One sentence each)

1. What are mountains?
   Answer: Mountains are high landforms that rise steeply above the surrounding land.
2. Name one major mountain range of the world.
   Answer: The Himalayas are a major mountain range.
3. What is a river?
   Answer: A river is a natural flowing stream of water.
4. Name the longest river in the world.
   Answer: The Nile is the longest river in the world.
5. Which river is known as the largest by volume?
   Answer: The Amazon River is the largest by volume.
6. What is a desert?
   Answer: A desert is a dry region that receives very little rainfall.
7. Name the largest hot desert in the world.
   Answer: The Sahara Desert is the largest hot desert.
8. Which desert is located in India?
   Answer: The Thar Desert is located in India.
9. Why are rivers important?
   Answer: Rivers are important because they provide water and support agriculture.
10. How do mountains affect climate?
    Answer: Mountains affect climate by blocking winds and causing rainfall.

B. Long Answer Questions

(3–5 sentences each)

11. Describe the Himalayas.
    Answer: The Himalayas are the highest mountain range in the world. They are located in Asia. Mount Everest, the highest peak on Earth, lies in this range. The Himalayas influence the climate of the Indian subcontinent.
12. Write a short note on the Andes Mountains.
    Answer: The Andes Mountains are located in South America. They are the longest mountain range in the world. The Andes run along the western edge of the continent. They have many high peaks and plateaus.
13. Explain the importance of rivers.
    Answer: Rivers provide fresh water for drinking and farming. They help in irrigation and support agriculture. Rivers also serve as important transport routes. Many civilizations developed along river banks.
14. Describe the Nile River.
    Answer: The Nile River flows through northeastern Africa. It is the longest river in the world. The river has supported human life for thousands of years. Ancient Egyptian civilization developed along its banks.
15. What are deserts and how are they formed?
    Answer: Deserts are areas that receive very little rainfall. They are formed due to dry winds, distance from seas, or mountain barriers. Deserts have extreme temperatures. Vegetation is very limited in deserts.
16. Write about the Sahara Desert.
    Answer: The Sahara Desert is located in northern Africa. It is the largest hot desert in the world. The region has very high temperatures during the day. Rainfall is very scarce in this desert.
17. How do mountains act as barriers?
    Answer: Mountains block the movement of winds. They cause rainfall on one side and dryness on the other. This affects climate and vegetation. Mountains also act as natural boundaries between regions.
18. Explain the role of rivers in human settlement.
    Answer: Rivers provide water for daily use and farming. Fertile soil is found near rivers. This attracts human settlements. Cities and towns often develop near rivers.
19. Describe the Thar Desert.
    Answer: The Thar Desert is located in India and Pakistan. It is also called the Great Indian Desert. The region receives very little rainfall. It has sandy soil and sparse vegetation.
20. Why are physical features important to study?
    Answer: Physical features shape the Earth’s surface. They influence climate, vegetation, and wildlife. Human activities depend on these features. Studying them helps us understand geography better.

🧠 Multiple Choice Questions (MCQs)

(With Answers and Detailed Explanations)

1. Which is the highest mountain range in the world?
   a) Alps
   b) Andes
   c) Himalayas
   d) Rockies
   Answer: c) Himalayas
   Explanation: The Himalayas contain Mount Everest, the highest peak.
2. Which is the longest river in the world?
   a) Amazon
   b) Nile
   c) Yangtze
   d) Ganga
   Answer: b) Nile
   Explanation: The Nile is the longest river.
3. Which is the largest hot desert?
   a) Thar
   b) Gobi
   c) Sahara
   d) Kalahari
   Answer: c) Sahara
   Explanation: The Sahara is the world’s largest hot desert.
4. The Andes Mountains are located in which continent?
   a) Africa
   b) Asia
   c) Europe
   d) South America
   Answer: d) South America
   Explanation: The Andes run along South America.
5. Which river flows through India?
   a) Nile
   b) Amazon
   c) Ganga
   d) Mississippi
   Answer: c) Ganga
   Explanation: The Ganga is a major river of India.
6. Deserts receive ______ rainfall.
   a) heavy
   b) moderate
   c) very little
   d) regular
   Answer: c) very little
   Explanation: Low rainfall is a key feature of deserts.
7. Which desert is found in India?
   a) Sahara
   b) Gobi
   c) Thar
   d) Atacama
   Answer: c) Thar
   Explanation: The Thar Desert is in India.
8. Which river is the largest by volume?
   a) Nile
   b) Amazon
   c) Yangtze
   d) Danube
   Answer: b) Amazon
   Explanation: The Amazon carries the most water.
9. Mountains are a source of ______.
   a) oceans
   b) rivers
   c) deserts
   d) plains
   Answer: b) rivers
   Explanation: Many rivers originate in mountains.
10. Which continent has the Sahara Desert?
    a) Asia
    b) Africa
    c) Europe
    d) Australia
    Answer: b) Africa
    Explanation: The Sahara is located in Africa.
11. Which mountain range is found in Europe?
    a) Andes
    b) Rockies
    c) Alps
    d) Himalayas
    Answer: c) Alps
    Explanation: The Alps are in Europe.
12. Rivers usually flow into ______.
    a) mountains
    b) deserts
    c) oceans or seas
    d) forests
    Answer: c) oceans or seas
    Explanation: Rivers end in seas or oceans.
13. Which desert is known as the cold desert?
    a) Sahara
    b) Thar
    c) Gobi
    d) Kalahari
    Answer: c) Gobi
    Explanation: The Gobi Desert is a cold desert.
14. Which feature influences rainfall?
    a) Rivers
    b) Mountains
    c) Deserts
    d) Plains
    Answer: b) Mountains
    Explanation: Mountains block winds and cause rainfall.
15. The Nile River flows through ______.
    a) Asia
    b) Europe
    c) Africa
    d) Australia
    Answer: c) Africa
    Explanation: The Nile flows through Africa.
16. Which is a major river of China?
    a) Nile
    b) Yangtze
    c) Ganga
    d) Danube
    Answer: b) Yangtze
    Explanation: The Yangtze flows in China.
17. Deserts have ______ vegetation.
    a) dense
    b) moderate
    c) rich
    d) sparse
    Answer: d) sparse
    Explanation: Low rainfall limits plant growth.
18. Which feature acts as a natural boundary?
    a) Rivers
    b) Plains
    c) Mountains
    d) Deserts
    Answer: c) Mountains
    Explanation: Mountains act as natural barriers.
19. Which river helped ancient Egyptian civilization?
    a) Ganga
    b) Nile
    c) Amazon
    d) Mississippi
    Answer: b) Nile
    Explanation: The Nile supported ancient Egypt.
20. Why are rivers called lifelines?
    a) They form deserts
    b) They block winds
    c) They support life and agriculture
    d) They create mountains
    Answer: c) They support life and agriculture
    Explanation: Rivers provide water and fertile soil.

✅ End of Lesson

Prepared strictly in accordance with the NCERT syllabus and CBSE Class 6 examination standards.