Across
- 1. this natural resource does not run out, but birds make it difficult for human to use it
- 6. an important gas in the atmosphere that protects Earth's surface from dangerous sun rays
- 7. this natural resource is used by humans for food
- 8. process that removes salt from water so that humans can drink it
- 10. the number of births per 1,000 individuals in an area over a certain amount of time
- 12. we can use this word to describe resources that are not easily found in nature
- 13. examples of these are coal and oil
- 15. we are practicing this when we don't use single use plastics
- 17. the number of individuals in a particular area
Down
- 2. this type of resource is not something that can be recreated or reused in our lifetime; oil is an example of this
- 3. this prefix refers to the land and rocks on Earth
- 4. these natural resources produce lumber and paper for people
- 5. this is a natural resource that we use; its atomic symbol is Au
- 9. when we burn fossil fuels our climate does this
- 11. there are 7.5 _______________people on Earth
- 14. this chemical of life is created when two hydrogen atoms bond with one oxygen atom
- 15. this element has the atomic symbol Ca
- 16. this type of resource is able to be used and replenished in a short amount of time