Across
- 3. composed of all life in other spheres
- 4. element vital to synthesizing proteins
- 6. carrying ______ : maximum population that an ecosystem can support
- 8. organisms that eat other organisms
- 9. substance that cycles through all spheres except atmosphere
- 10. organisms that break down dead or decaying material
- 12. organisms that create their own food
- 16. field that deflects solar winds
- 17. blanket of gases that surrounds earth
- 18. all the water systems on earth
Down
- 1. release of liquid water from plants as vapor
- 2. secondary source of external energy on earth
- 5. upper part of the mantle which is cool and brittle
- 6. the life-giving molecule
- 7. system in which energy and matter are exchanged
- 8. system in which only energy is exchanged
- 11. ________ spheroid : shape of earth
- 13. sphere composed of iron and nickel at earth's center
- 14. all the rock on the surface and molten interior of earth
- 15. the balance of energy entering and leaving earth
- 19. main source of external energy on earth