Across
- 6. eye disease of the lens causing partial or total blindness
- 8. a system of living beings in the sea each feeding on the one below it
- 12. a building complex to generate e.g. electricity
- 14. can be replaced with sth new of the same kind
- 15. power supply
- 16. greatly reduce the size, volume of something
Down
- 1. substance produced while making sth else
- 2. agricultural waste is used as a fuel or energy source
- 3. a type of a non-renewable energy resource
- 4. substance consisting of two or more chemical elements
- 5. generating a lot of debate
- 7. produced in connection with low and high tide
- 9. splitting of the nucleus of an atom
- 10. energy from the hot water and steam in the Earth
- 11. protect sth by covering it with a material against loss of e.g. heat
- 13. where hydrogen is combined with oxygen to produce heat and electricity