Across
- 4. an energy source that is not depleted and consistently replenished
- 9. caused by a chemical reaction with chemical compounds such as sulfur dioxide and nitrogen oxides with atmospheric water and oxygen. The resulting compound forms precipitate.
- 11. a renewable fuel made from the fermenting of plant materials or "biomass"
- 14. mining type that tunnels into the Earth to extract solid fuels
- 15. an energy source that is bought and sold
- 19. a fuel derived from fossilized biological remains
- 21. the process of turning petroleum into useful products
- 23. a solid fuel formed primarily from preserved plant materials
- 24. fossil fuel that is colorless and odorless
- 25. energy released by the fusion of atomic nuclei
Down
- 1. an energy source with a finite supply
- 2. a machine that converts wind energy into electricity
- 3. energy generated by the movement of wind
- 5. condensed oil that is further refined into usable fuels
- 6. energy from the movement of water driven by lunar phases
- 7. continuous accumulation of hydrocarbons in the subsoil
- 8. the process of drilling into the Earth and directing a high-pressure mixture of water, sand, and chemicals to release gas
- 10. liquid petroleum removed from the ground
- 12. using heat and pressure to convert existing polymers into short-chain hydrocarbons (monomers)
- 13. heat energy from the natural radioactive decay deep in the Earth
- 16. machine used for drilling deep holes in the Earth to extract oil
- 17. radiant light and heat from the sun
- 18. crude oil extracted from rocks and used to produce fuels
- 20. mining type to remove overlying rock to extract solid fuels
- 22. the ability to do work