Energy

4. main component of natural gas
10. CCS for short, process where carbon dioxide is pumped and buried underground in rock formations
11. country with the largest reserves of oil
13. to calculate this, divide energy returned by energy invested
14. process that separates crude oil into its various hydrocarbon components

1. behavior changes that save energy; ex: unplugging unused devices
2. petrochemicals from oil are used to make these everyday products
3. the main fossil fuel used for transportation
5. the ability to obtain more energy output while using less energy input
6. fossil fuel formed from woody land plants that lived millions of years ago
7. fossil fuel that is cleaner burning than coal and major source of US electricity
8. worst environmental disaster in US history
9. US government program that rates appliances according to their energy efficiency
12. largest producer of oil in the world (country)
15. technique that pumps chemically treated water under high pressure into layers of rock to crack them and release oil/gas