Across
- 2. Wind energy use these to generate energy
- 4. what type of energy uses heat from hot springs
- 5. who was the first to use hydrogen fuel cells
- 8. Solar converts this into radiation
- 9. The most abundant element in the universe
- 12. The ability to do work
Down
- 1. any renewable plant or animal source used as fuel
- 3. what is solar mainly used for
- 6. What can geothermal energy cause
- 7. what is hydropower fueled by
- 10. the process that splits hydrogen from water
- 11. the structure used by tidal energy