Energy sources are substances or objects that can be used to generate energy. GAS, FUEL, OIL, SUN, COAL, SOL, ATOMS, STEAM, emitter, GLUCOSE, COALMINE, oilfield, snackbar, granolabar, and powerplant are all examples of energy sources. GAS is a combustible hydrocarbon GAS, FUEL is a substance that can be used to produce energy, OIL is a flammable liquid derived from petroleum, SUN is the star at the center of our solar system, COAL is a combustible black or brownish-black sedimentary rock, SOL is a unit of energy equal to one joule per second, ATOMS are the smallest particles of an element, STEAM is water vapor, emitter is a device that emits radiation, GLUCOSE is a simple sugar found in plants, COALMINE is a place where COAL is mined, oilfield is a place where OIL is extracted, snackbar is a small restaurant selling snacks, granolabar is a type of snack bar made with oats and other grains, and powerplant is a facility that generates electricity.