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Energy from the Earth's external celestial bodies (mainly solar energy). In addition to direct radiation, and for wind energy, water, bio-energy and mineral energy to provide the basis for the generation. The vast majority of the energy required by man comes directly or indirectly from the sun. It is a variety of plants through photosynthesis to solar energy into chemical energy stored in the plant body. Coal, oil, natural gas and other fossil fuels are also buried in the ancient plants and animals through the long geological age formed. They are essentially solar energy that is fixed by ancient creatures. Besides, water, wind, wave energy, ocean currents can also be converted from solar energy.


The energy of the earth itself. Such as nuclear energy, geothermal energy and so on. The energy of the earth itself usually refers to the energy associated with the heat inside the earth and the energy associated with the nuclear reaction. Hot springs and volcanic eruptions are magmatic. Earth can be divided into crust, mantle and core three layers. The crust is the surface of the earth's surface, the general thickness of a few kilometers to 70 km range. Under the crust is the mantle, which is mostly molten magma, the thickness of 2900 km. Volcanic eruption is generally this part of the magma jet. The interior of the earth is the core, and the core temperature is 2000 degrees. It can be seen that the geothermal resources on the planet are also large. The last one could be illustrated as the tidal energy. Earth and other objects interact with the energy generated.