Across
- 1. fuel- fuel consisting of the remains of organisms preserved into rocks
- 4. system- the sun revolves around a gravitational field
- 5. capable of being reused
- 7. biggest star and produces the solar energy
- 8. plants- generates electricity
Down
- 2. the rays of the sun
- 3. the process of becoming warmer or by rising temperature
- 6. the 3rd planet from the sun