Sun is the only source of obtaining heat on the surface of the Earth.
The importance of heating thus, obtained is shown in the following points:
1. If there was no insolation on the earth, then the earth would be a snow-bound planet, but at present, there is no such situation due to the receipt of heat.
2. Receiving insolation is the basis of the life of the living beings, if such a situation were not there, then the Earth would be a deserted place rather than being populated.
3. The development of a variety of vegetation has been possible only due to insolation.
4. In the event of the absence of insolation, the earth would be a dark planet.
5. Due to insolation, conditions like natural landscapes, seasons, climate, humidity and precipitation have developed on the earth’s surface. It is not possible to imagine them in the absence of this.
6. Humans, organisms and animals and birds use heat from the sun for their activities.
7. From insolation, the atmosphere receives heat due to which heat budget is retained.
