Topic outline

    • Major Domains of the Earth

      Q1. Fill in the blanks.

                               i.        Life exists in the biosphere zone.

                              ii.        Africa is the only continent through which the tropic of Cancer, the Equator and the Capricorn pass.

                             iii.        The Andes is the world’s longest mountain range.

                             iv.        Australia is called an island country.

                              v.        The world’s longest river the Nile flows through Africa.

                             vi.        The Arctic Ocean is connected with the Pacific Ocean by a narrow stretch of shallow water known as Berring Strait.

               vii.        Europe lies to the west of Asia.


      Q2. True/False

                                i.        The Atlantic Ocean is ‘S’ shaped. True

                               ii.        Biosphere is one of the layers of the Atmosphere. False

                              iii.        The South Pole lies almost at the centre of Antarctica. True

                              iv.        Africa is the second largest country after Asia. True

                               v.        Pacific Ocean is ‘L’ in shape. False

                              vi.        The coastline of Atlantic Ocean is highly indented. True

               vii.        The atmosphere is composed mainly of nitrogen and argon. False

      Q3. Why nitrogen considered as a significant gas?

      Ans. Nitrogen is considered as a significant gas because it helps in the growth of living organisms.


      Q4. Name the three main components of the environment.

      Ans. The three main components of the environment are lithosphere, atmosphere and hydrosphere.


      Q5. Name the oceans that surround the continent North America.

      Ans. Oceans that surround the continent North America are Pacific Ocean, Atlantic Ocean and Arctic Ocean.


      Q6. Which two oceans surround South America on the east and the west?

      Ans. On the east –Atlantic Ocean and on the west – Pacific Ocean


      Q7. Why Carbon dioxide (CO2) is considered as an important constituent of air?

      Ans. Carbon dioxide (CO2) is important as it absorbs heat radiated by the earth, thereby keeping the planet warm. It is also essential for the growth of plants.

      Q8. Why oxygen is so important?

      Ans. Oxygen is essential for our survival because oxygen is the breath of life.


      Q9. Write the name of Indian research stations in Antarctica.

      Ans. Maitri and Dakshin Gangotri are the Indian research stations in Antarctica.


      Q10. State the percentage of the earth which is covered with water.

      Ans. More than 71 percent of the earth is covered with water.


      Q11. What percentage of earth’s water found in oceans?

      Ans. More than 97% of the Earth’s water is found in the oceans.


      Q12. Which is the world’s longest river?

      Ans. The world’s longest river is Nile which flows through Africa.


      Q13. Name the world’s largest river.

      Ans. Amazon is the world’s largest river.


      Q14. Which is the world’s largest hot desert and where is it located?

      Ans. The Sahara Desert, the world’s largest hot desert, is located in Africa.

      Q15. In which hemisphere does Asia lie?

      Ans. The continent Asia lies in the Eastern Hemisphere.


      Q16. Which two oceans surround South America on the East and the West?

      Ans. Atlantic Oceans surrounds South America on the East and Pacific Ocean surrounds on the West.


      Q17. Write the names of the continents that surround the Pacific Oceans.

      Ans. Asia, Australia, North and South Americas surround it.


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