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?
ABoth Statement-II and Statement-III are correct and both of them explain Statement-I
BBoth Statement-II and Statement-III are correct, but only one of them explains Statement-I
COnly one of the Statements II and III is correct and that explains Statement-I
DNeither Statement-II nor Statement-III is correct
Answer & Solution
Correct answer: A. Both Statement-II and Statement-III are correct and both of them explain Statement-I
Answer: A. Both Statement-II and Statement-III are correct and both explain Statement-I.
Rainfall drives weathering through two distinct chemical mechanisms:
(II) Rainwater dissolves atmospheric CO2 to form weak CARBONIC ACID (H2CO3) — the agent of carbonation weathering, which dissolves limestone, marble and feldspar minerals.
(III) Rainwater also carries dissolved OXYGEN — the agent of oxidation weathering, particularly of iron-bearing minerals (rusting), turning olivine and pyrite into iron oxides.
So both II and III independently explain the weathering action of rain on rocks.
Source: NCERT Class 11 Fundamentals of Physical Geography, Ch 6 (Geomorphic Processes).
Related questions
In Petlawad block of Jhabua, what did each household do to revive common pasture land?Jhabua, one of India's five most backward districts, has a high concentration of which triWhich agency classified India's wastelands using remote sensing?Soil erosion, waterlogging, salinisation and alkalinisation all lead to what?Which government mission aims to improve the quality of life in urban slums?Dharavi, called Asia's largest slum, lies in which city?Roughly what share of India's population lived in rural areas in 2011?Ramesh migrates from Odisha to work as a welder while his wife stays in the village. What