Q: What kind of energy is specifically defined as the energy that is available to do work? Choices: - used - new - old - free A:
free

Q: The best thermal conductors are also the best conductors of what, which is also related to the density of free electrons in them? Choices: - light - pollution - sound - electricity A:
electricity

Q: Natural gas is often found along with what other fossil fuels in underground deposits? Choices: - methane and oil - coal and methane - repository and oil - coal and oil A:
coal and oil