Across
- 1. Produces oxygen
- 4. Fuels made over millions of years
- 7. Raw material to make nuclear energey
- 8. Covers 71% of earth
- 10. Running out eventually
Down
- 2. Meeting needs without future harm
- 3. Mined from earth
- 5. Essential for agriculture
- 6. Main source of energy on earth
- 9. Can be replenished again and again