Across
- 6. The practice of using resources wisely and efficiently to preserve them for future generations (12 letters)
- 7. Energy harnessed from the sun (5 letters)
- 8. Measure of how effectively energy is utilized (10 letters)
Down
- 1. Electricity produced by flowing water (12 letters)
- 2. Energy sources that can be replenished naturally (9 letters)
- 3. the capacity to do work or produce heat (6 letters)
- 4. Ability to maintain or support an energy source without depleting resources (13 letters)
- 5. Remnants of ancient life forms, often found in sedimentary rocks, that can be burned for energy (7 letters)