Across
- 4. are energy resources made from carbon-rich plant and animal remains.
- 6. is an energy source that can be easily reproduced or replaced by nature
- 7. is extracted from heat stored within Earth
- 10. means "rock oil"
- 11. is renewable and can help you harness the energy from the sun.
Down
- 1. includes living or recently dead organic material that can be used as fuel.
- 2. is a sedimentary rock formed from the remains of dead plants at the bottom of ancient swamps.
- 3. a resource that forms at a rate much slower than the rate at which the resource is consumed.
- 5. earths main source of energy.
- 8. the ability to cause change.
- 9. is a nonrenewable substance. its chemical energy comes from organisms that died millions of years ago.