Across
- 2. a useful item that comes from nature
- 4. a liquid that formed millions of years ago that we burn for energy
- 6. the use of resources in a way that ensures availability to future generations
- 8. a turbine that collects energy from the wind
- 9. a resource that is replenished before it can be depleted
- 10. a heat source from the earth
- 12. the total amount of a certain resource consumed
Down
- 1. a resource that is used up faster than it is replenished
- 3. the average amount of a certain resource consumed
- 5. a barrier to hold back water (used to collect energy from water)
- 6. a panel that people install on roofs to collect solar energy
- 7. a rock containing a large amount of valuable elements
- 11. a mixture of rocks and minerals with living and nonliving parts