Give reasons for the following:

The amount of insolation received on the earth surface is not uniform.

Give reasons for the following:

Hill stations are cooler even in the summer.

The process through which heat passes from warmer to colder substances as long as temperature difference exists, is known as

1. Convection
2. Conduction
3. Radiation
4. Advection

Which of the following reasons is responsible for the minimum insolation at Poles?

1. The earth is spherical in shape
2. Poles are far away from the equator.
3. Poles get extremely slanting rays of the sun.
4. All the above