Energy Vocabulary Crossword Puzzle

QUESTIONS LIST: fossil carbon : carbon in fossil fuels, geothermal : heat energy that comes from the natural radioactive decay of elements deep within earth, thermal mass : property of a building material that allows it to maintain heat or cold, tidal energy : energy that comes from the movement of water driven by the gravitational pull of the moon, energy conservation : finding and implementing ways to use less energy, peak demand : greatest quantity of energy used at any one time, photovoltaic : system of capturing energy from sunlight and converting it directly into electricity, renewable : energy source that can be renewed in a human generation, biodiesel : diesel substitute produced by extracting and chemically altering oil from plants, passive: construction designed to take advantage of solar radiation without active technology, wind energy : energy generated from the kinetic energy of moving air, tiered rate system: billing system used by electric companies, customers pay higher rates as their use goes up, electrolysis : application of an electric current to water molecules to split them into hydrogen and oxygen, biofuel : liquid fuel created from processed or refined biomass, net removal : process of removing more than is replaced by growth, flex fuel : vehicle that runs on either gasoline or a gasoline/ethanol mixture, fuel cell : electrical-chemical device that converts fuel into an electrical current, active : energy captured from sunlight with advanced technologies, carbon neutral : activity that does not change atmospheric co2 concentrations, potentially renewable : energy source that can be regenerated indefinitely as long as it is not overharvested, siltation : accumulation of sediments, primarily silt, on the bottom of a reservoir, hydroelectricity : electricity generated by the kinetic energy of moving water, ethanol : alcohol made by converting starches and sugars from plant material into alcohol and co2