Across
- 7. this gas is released when coal burns
- 8. highest grade of coal
- 10. accounts for 19% of Ecuador's energy use
- 11. provide 80% of the world's energy
- 13. most used energy source in Ecuador
- 14. an energy source that can be replenished
Down
- 1. Ecuador exports most of its oil to this country
- 2. energy in a transformed state
- 3. country that uses the most amount of energy
- 4. country with biggest oil reserves in the world
- 5. sector where most energy is used in the US
- 6. a solid, black rock that is highly combustible and made from organic matter
- 9. source that uses the ocean tides to generate energy
- 12. the ability to do work
- 15. main source of energy in the US until 1850