Question

why the amount of insolation decreases from equator towards the poles​

Answer 1

Answer:

The amount of insolation decreases from equator towards the poles​ because the light from the sun falls almost at right angle to the horizontal on the equator, while it descends at oblique angle on the north and south pole.

Explanation:

Insolation or Solar irradiance can be defined as the power per unit area which is measured in watt per square metre, W/m2.

Irradiance may be estimated in space or at the Earth's exterior after atmospheric absorption and disbanding.

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.