Across
- 5. natural material that is useful for humans
- 6. big body of water flowing through land
- 8. garbage
- 10. large body of salt water that covers most of earth
- 11. dependent upon
- 12. small body of flowing water
- 13. put harmful materials in air/water
- 14. any individual living thing
- 15. all the living/nonliving things that interact
- 18. large sheet of ice or snow that moves over Earth
- 19. a model that shows feeding relationships
- 20. physical matter which living/nonliving are made
- 22. the third planet from the sun; the one we live on
- 23. mineral found in ocean used for seasoning/preserving
- 24. a natural, solid substance found in rocks
- 27. water that is not salty, found in streams/lake
- 30. earth's crust, mantle, inner/outer core
- 33. gas in the air made of carbon/oxygen atoms
- 35. region where water collects/drains into river
- 36. once it is used, it cannot be made or reused
Down
- 1. natural resource that runs out
- 2. to protect; prevent wasteful overuse of resource
- 3. all of the water on, under, and above Earth
- 4. resources obtained from the earth
- 7. opening in earth's surface and gases/magma erupt
- 9. can be used repeatedly without hurting supply
- 10. gas in Earth's atmosphere that we breathe
- 16. a large, circular pit in the surface of planet
- 17. water containing salt
- 21. man-made ecosystem that can be observed
- 25. a coastal body of water, salt and fresh water mix
- 26. a natural resource that can be replaced
- 28. a compound made of hydrogen and oxygen
- 29. rain, snow, sleet, hail, freezing rain
- 31. small organisms that drift through water
- 32. create new materials from used products
- 34. a scientific wonder or happening