7 GR. Food Chains, webs, and cycles DD:

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Across
  1. 2. plants release water ____ thru transpiration.
  2. 5. breaks down the consumers and the producers.
  3. 6. Energy can get ____ a terrarium.
  4. 8. 78% of Nitrogen is ____ and is unusable by humans.
  5. 11. Decomposers ____ CO2 into the air from the soil.
  6. 13. A series of events where one consumer eats another is a food____.
  7. 14. two Hydrogen atoms and one oxygen atom can create _____.
  8. 15. On Earth, the number of Carbon atoms remains______
  9. 16. the process of changing water from a ___ to a liquid is called condensation.
  10. 18. Decomposers release carbon compounds to the ___.
  11. 19. Human activities affect the ___ of carbon and oxygen in the air.
  12. 20. The water you drink may have passed thru the water cycle ______ of times.
Down
  1. 1. when organisms ___ the decomposers break down the remains.
  2. 3. Most producers take in CO2 gas from the ____ during photosynthesis.
  3. 4. can eat either plants or animals.
  4. 7. When plants and ___ are removed from the ecosystem, there are fewer producers to absorb CO2.
  5. 9. Many over lapping food chains form a food ___.
  6. 10. eat only plants
  7. 12. organisms use the energy from, producers for life activities, but some energy is lost as____.
  8. 13. A terrarium is a ____ system for matter.
  9. 17. Rain falling upon the earth may be absorbed into the ground or flow into___. READ PP215 TO 221 FOR THE ANSWERS!