Across
- 2. of the greatest importance to the way things might happen
- 5. the power from something such as electricity or oil
- 6. costing a lot of money
- 8. derived from the sun
- 9. capable of being replaced by natural ecological cycles
- 11. not expensive
- 13. a person who buys goods or a service
- 15. costing little money
- 16. to collect
- 19. strength
Down
- 1. to put electricity into an electrical device such as a battery:
- 3. something that covers
- 4. to cause something to exist
- 7. causing little or no damage to the environment and therefore able to continue for a long time
- 9. the covering that forms the top of a building
- 10. a means of carrying or transporting something
- 12. goal, aim
- 14. what covers a roof
- 17. to work with
- 18. a device for producing electrical energy from chemical energy