Discussion
Assertion (A) : We feel colder on mountains than on plains.
Reason (R) : Temperature decreases with altitude.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Air temperature falls by roughly \( 6.5^{\circ}\mathrm{C} \) for every kilometre of altitude, because the air aloft is thinner and further from the ground that warms it. That fall is precisely why mountains feel colder than the plains below. Both are true and R explains A.
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