Across
- 2. a colorless volatile flammable liquid which is produced by the natural fermentation of sugars
- 4. a biofuel intended as a substitute for diesel
- 6. produced by the fermentation of organic matter
- 7. power obtained by harnessing the energy of the wind
- 8. a living organism that feeds on organic matter
Down
- 1. a living organism of the kind exemplified by trees
- 3. hydroelectric power
- 5. used for fuel or timber
- 6. the total mass of organisms in a given area or volume