Mots Croisés thermodynamicsVersion en ligne thermodynamics par Elkin Alfredo Velandia Vargas 1 Natural gas is a non-renewable energy source, composed of a mixture of different gases that react very well with oxygen through its combustion, being the second most used energy source on the planet 2 It is the energy that can be obtained by harnessing the heat inside the Earth. ... Energy stored in the form of heat in rocks, soils and groundwater 3 4 Nuclear energy is the energy that is released as a result of the reaction that occurs when heavy atomic nuclei divide. 5 6 Photovoltaic solar energy is a renewable energy source that is obtained directly from solar radiation through a solar panel that in turn transforms it into electrical energy. 7 Hydraulic energy is that produced with the movement of water, either through mills or dams, for example 8 9 9 4 2 5 6 8 7 3