Consider the following statements :
Statement-I: Rainfall is one of the reasons for weathering of rocks.
Statement-II: Rain water contains carbon dioxide in solution.
Statement-III: Rain water contains atmospheric oxygen.
Which one of the following is correct in respect of the above statements?
(a). Both Statement-II and Statement-III are correct and both of them explain Statement-I
(b). Both Statement-II and Statement-III are correct, but only one of them explains Statement-I
(c). Only one of the Statements II and III is correct and that explains Statement-I
(d). Neither Statement-II nor Statement-III is correct
Explanation:
Rainfall is a major factor in both physical and chemical weathering.
Rainwater absorbs carbon dioxide from the atmosphere, forming carbonic acid, which contributes to chemical weathering.
Rainwater comes in contact with the atmosphere and absorbs oxygen, which plays a role in oxidation, a type of chemical weathering.
Therefore, the correct answer is (a).