Because almost all processes occurring on the surface of the earth rely on the sun as their ultimate source of energy. The only ones that don't are those that rely on geothermal energy.
Sun is the source of heat and light energy. It provides energy on earth's surface.
The sun is the most important energy source of all. Without the sun's energy heating the Earth's surface, there would be no potential for life. The sun is continuously radiating energy totaling 400 trillion trillion watts. Earth is ideally positioned in its distance from the sun so that the heat energy from the sun is not overbearingly hot, as on closer planets (Mercury, for example), and not too small to sustain temperatures that are suitable for life. The sun's energy can also be harnessed through the technology of solar cells, which convert the sun's energy (in photons) to usable electricity. Solar energy can power anything from a calculator to cars to entire buildings.
Because the sun gives of heat which keeps our muscles warm, which lets us use energy to do stuff. and all the other necesities..
The energy of the sun comes from nuclear fusion occurring in the sun's core. The moon does not have an internal energy source. What little energy falls on it comes from the sun.
the major source is sun
the sun
the sun
The sun
The sun is the main source of energy on earth.
The Earth has two sources of energy, the sun's radiation and heat from inside the Earth. The sun is most important and life could hardly exist except at a very primitive level without it.
The sun
the sun
the sun
Nuclear energy that is the source of sun energy which in turn is the source of fossil and renewable energies.
LED is not the most important source of light, the Sun is.
The sun is the major source of energy in the desert as well as most other biomes on earth.
Solar energy.