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Major domains of the earth

Major domains of the earth

Question 1: Answer the following questions briefly.

  1. What are the four major domains of the Earth?
    Answer: The four major domains of the Earth are as follows:

    1. Lithosphere: The solid portion of the earth on which we live is called the Lithosphere.
    2. Hydrosphere: All the water bodies together constitute Hydrosphere.
    3. Atmosphere: The gaseous layers that surround the earth, is the Atmosphere
    4. Biosphere: It is the narrow zone where we find land, water and air together, which contains all forms of life.
  2. Name the major continents of the Earth.
    Answer: There are seven major continents of the Earth. These are separated by large water bodies. The continents are: Asia, Europe, Africa, North America, South America, Australia and Antarctica. They cover about 29 percent of the Earth’s surface.
  3. Name the two continents that lie entirely in the Southern Hemisphere.
    Answer:
    The two continents that lie entirely in the Southern Hemisphere are: Australia and Antarctica.
  4. Name the different layers of atmosphere.
    Answer:
    There are five different layers of atmosphere. They are: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
  5. Why is the Earth called the ‘blue planet’?
    Answer:
     The Earth is called the ‘blue planet’ because of the following reasons:

    1. It appears blue in colour due to the reflection of light from the water on its surface.
    2. It is so called also because three fourth or more than 71 percent of its surface is covered with water.
  6. Why is the Northern Hemisphere called the Land Hemisphere?
    Answer:
     The Northern Hemisphere is called the ‘Land Hemisphere’ because the greater part of Earth’s land mass, i.e. majority of the continents lie in the Northern Hemisphere lie in the Northern Hemisphere.
  7. Why is the biosphere important for living organisms?
    Answer:
     The biosphere is the narrow zone of contact between land, water and air. It is the zone in which the life exists, as a result of interaction between land, water and air. All the living organisms are linked to each other and to the biosphere for survival.

Question 2: Tick the correct answers.

  1. The mountain range that separates Europe from Asia is
    1. the Himalayas
    2. the Andes
    3. the Urals
  2. The continent of North America is linked to South America by
    1. an Isthmus
    2. a Canal
    3. a Strait
  3. The major constituent of atmosphere by percent is
    1. Carbon dioxide
    2. Nitrogen
    3. Oxygen
  4. The domain of the Earth consisting of solid rocks is
    1. the Hydrosphere
    2. the Atmosphere
    3. the Lithosphere
  5. Which is the largest continent?
    1. Asia
    2. Australia
    3. Africa

Answer:

  1. (iii) the Urals
  2. (i) an Isthmus
  3. (ii) Nitrogen
  4. (iii) the Lithosphere
  5. (ii) Asia

Question 3: Fill in the blanks.

  1. The deepest point on the Earth is _________ in the Pacific Ocean.
  2. The _________ Ocean is named after a country.
  3. The _________ is a narrow contact of land, water and air that supports life.
  4. The continents of Europe and Asia together are known as __________.
  5. The highest mountain peak on the Earth is __________.

Answer:

  1. The deepest point on the Earth is Marina Trench in the Pacific Ocean.
  2. The Indian Ocean is named after a country.
  3. The biosphere is a narrow contact zone of land, water and air that supports life.
  4. The continents of Europe and Asia together are known as Eurasia.
  5. The highest mountain peak on the Earth is Mount Everest.
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