Weathering of Rocks - Rainfall
Question
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?
Options
Both Statement-II and Statement-III are correct and both of them explain Statement-I
Both Statement-II and Statement-III are correct, but only one of them explains Statement-I
Only one of the Statements II and III is correct and that explains Statement-I
Neither Statement-II nor Statement-III is correct
Explanation
All statements are correct. Rainfall induces chemical weathering. Statement-II is true as dissolved CO2 forms carbonic acid, leading to carbonation of minerals like limestone. Statement-III is true because dissolved oxygen in rain leads to the oxidation of iron-rich rocks. Both dissolved CO2 and O2 in rainwater directly explain how rainfall causes this weathering.
Answer: (a).
Question details
Year
2024
Paper
GS Paper 1
Question
Q7
Subject
Geography
Sub-topic
Geomorphology & Earth Science
Type
Assertion-Reason
Difficulty
Medium
Nature
Static
Source hint
NCERT Geography Cl.11 Ch.6
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