Question

why does insolation decrease from the equator towards the poles?

Answer 1

Sunlight falls almost vertically on the equator, while it falls at slanting angle on the poles. Due tothis, amount of insolation decreasesfrom equator towards poles.

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Answer 2

Answer:

Sun rays falls almost vertically on the equator and covers less space whereas sun rays falls at slanting angle on the poles and covers more space. Thus, the amount of insolation decreases from the equator towards the poles.