Answer:
(a) The four major domains of the earth are air, land, water and life.
(b) The major continents of the earth are Asia, Africa, Europe, North America, South America, Antarctica and Australia.
(c) The two continents that lie entirely in the Southern Hemisphere are Australia and Antarctica.
(d) The different layers of atmosphere are Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
(e) The more than 71% of the earth is covered with water and 29% is with land. Therefore, from outer space it appears blue, so it is called a blue planet.
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