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