Across
- 3. car uses electricity instead of gasoline
- 4. fuels natural gas, petroleum and coal
- 6. amount of resource
- 9. water found in rocks underwater
- 12. growth increase amount of people
- 13. using a resource
- 15. a fossil fuel tha tpowers cars
- 18. methods used to give people clean water
Down
- 1. substance used for treating diseases
- 2. rate number of people who die per 1000 people
- 5. things people don´t need and throw out
- 7. parts of earth wher humans can live
- 8. resources materials found in nature
- 10. too many people in a place
- 11. rate number of babies born per 1000 people
- 14. something that can be replaced
- 16. ores rocks cointaing useful metals
- 17. upper layer of earth; plants grow