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(a) What are the four major domains of the earth?

(b) Why is the earth called the 'Blue Planet' ?

                                                       

Answer:

(a) The four major domains of the earth are:

(i) Lithosphere

(ii) Hydrosphere

(iii) Atmosphere

(iv) Biosphere

(b) The earth is called the "Blue Planet" because more than 71 percent of earth is covered with water. Therefore, from outer space it appears blue.