Discussion
Mean temperature falls from equator to pole chiefly because
Answer: A
Correct answer: sunlight strikes high latitudes obliquely
A given beam of sunlight spreads over a larger area of ground where it strikes obliquely, so the energy per square metre falls with latitude; the longer path through the atmosphere increases the losses further. The Earth’s distance from the Sun varies with the season rather than the latitude, and the equator is if anything slightly further from the centre than the poles.
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