Discussion
Given below are the two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A) : The velocity of moving ice increases with steepness of slope of the area and thickness of glacial ice.
Reason (R) : The velocity decreases to the sides owing to lesser depth of ice and friction against the valley walls and the bottom floor.
In the context of the above two statements, which one of the following is correct ?
Answer: B
Both statements are true, but the reason does not explain the assertion, so the answer is B. Ice moves faster on steep slopes and where the ice is thick, which is the assertion. The reason is also true: movement is slower at the sides and bottom because of friction with the valley walls and floor and because the ice is thinner there. But the slowing at the sides does not explain why velocity increases with slope and thickness, so (R) is not the explanation. Options C and D make one true statement false.
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