Earth Day

7. part of the earth’s atmosphere that repels the sun’s ultraviolet rays. (2 words)
8. Large marsupial
11. of forest and trees
15. to do with leftover food
16. we talk about the 3R's the middle R is _________
19. name given to gasses that trap heat and cause global warming.
20. kind of vehicle
21. from polluted water
22. Has a trunk
23. warming causes melting of _______

1. layer of earth's atmosphere
2. Earth Day promotes ___ Cities
3. Study of releationship between organism and environment
4. Likes to chase mice
5. and careful use of natural resources
6. Man's best friend
9. Flying mammal
10. Comination of smoke and fog that pollutes atmosphere
12. study of relationship between plants of animals and their surroundings
13. an item again
14. most abundant energy source capable of being harnessed by humans. (2 words)
17. arrangement with vehicle
18. that spreads disease