Question

Which one of the following is not related to the formation or modification of the present atmosphere?
(a) Solar winds
(b) Differentiation
(c) Degassing
(d) Photosynthesis
NCERT Solutions for Class 11th Geography Fundamental of Physical Geography Chapter 2 Exercise 1(iii)

Answer 1

Thank you for asking the question!
One of the methods which is not related to the modification of the atmosphere is the method of differentiation, option B. There is no such method introduced yet. Other methods like Solar winds, Degassing, Photosynthesis adds up in the modification and formation of present atmosphere. All these methods helps in making the environment pollution free and healthy. These methods also supports the survival of living beings. 
Hope it helps.

Answer 2

Answer: b

Explanation: As the differentiation is concerned with formation of different layers of earth. But is not related to present atmosphere of earth.