Question

The ultimate source of energy is __________.

Answer 1

1. Sun provides us solar energy which in turn produces both light energy as well as heat energy.
2. Solar energy is received by the earth and are used in various natural processes which are used for Sustainability of life.
3. Solar energy is used by the plants for photosynthesis.
4. Sunlight is used for creating fossil fuels.

Thus, we can say that Sun is the ultimate source of energy.