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A national network of high speed trains can be powered by a combination of renewable energy sources including wind, solar, geothermal, and ocean/tidal energy.America's dependency on oil is the most severe in the world, and inevitably pulls us into costly resource wars.
It only passes from one state to another, and steam engines are the perfect example of seeing how it happens. For steam engines to work, energy is derived from four different kinds: chemical energy, heat energy, kinetic energy and then finally, potential energy. Chemical energy.