Across
- 2. a material, such as sand, used to keep cracks in shale rock open to allow gas or oil extraction
- 5. A machine that converts mechanical energy into electrical energy
- 7. a small dam used to hold back a tide
- 10. A treaty agreement obtained by a united nations group that supervises the safety and security of shipping
- 11. the creation of methane from the breakdown of organic materials in an anaerobic digester
- 12. power generated from sunlight
- 13. resources that cannot be replaced
- 14. process of obtaining oil or gas from shale rock by breaking open the rocks
- 15. the use of tides to generate electricity
Down
- 1. Resources that exist in a finite amount
- 3. a ship design that uses a second layer allowing cargo to remain safe if the external layer is damaged
- 4. A vessel used to heat water to convert it to steam
- 6. process that makes use of a magnet and metal coil to generating electricity
- 8. the use of changes in the height of a body of water to generate electricity
- 9. producing ethanol from fermentation