Across
- 3. radioactive element used in nuclear fission to generate energy
- 5. a nonrenewable energy resource that forms from the remains of organisms that lived long ago
- 7. these remains form coal
- 10. lignite changes to this under heat and pressure; second type of coal formed
- 11. the solid fossil fuel most widely used to generating electrical power
- 12. a mixture of gaseous hydrocarbons
- 14. the energy released when the nuclei of atoms are split or combined
- 15. a natural resource that humans use to generate energy
Down
- 1. also known as crude oil
- 2. most valued type of coal and is highly valued for its carbon content which gives off the most energy and least pollutants
- 4. these remains form petroleum and natural gas
- 6. the splitting apart of radioactive atoms into two or more fragments
- 8. partially decayed swamp plants; first step in forming coal
- 9. generate electricity using nuclear fission
- 11. when neutrons are released from fission and bombard more nuclei which releases energy
- 13. peat changes to this under heat and pressure; first type of coal