(a) The four major domains of the Earth are Lithosphere, Atmosphere, Hydrosphere and Biosphere.
(b) There are 7 major continents of the earth. They are as follows:
-
Asia
-
Europe
-
Africa
-
North America
-
South America
-
Australia
-
Antarctica
(c) Two continents that lie entirely in the southern hemisphere are Australia and Antarctica.
(d) The different layers of the atmosphere are listed below:
-
Troposphere
-
Stratosphere
-
Mesosphere
-
Thermosphere
-
Exosphere
(e) The earth is called the blue planet because 71% of the earth is covered with water, and the remaining 29% makes up the land.
(f) The northern hemisphere is called the land hemisphere because a major part of the landmass lies in it.
(g) The Biosphere is important for living organisms because life exists here due to the presence of 3 major components, land, air and water.