Cycles of matter

Across

5. formed from the remains of dead plants and animals
6. animal waste becomes ammonia
7. live on the roots of some plants
9. water evaporating off the leaves of plants.
11. plants absorb CO2 and create C6H12O6 for animals.
12. dead organisms breaking down and returning carbon to the soil.
14. Water falls from the atmosphere in the form of rain, snow, or sleet
15. combining nitrogen and hydrogen to form ammonia.
17. water moves through soil into ground water.

Down

1. nitrate is changed to nitrogen gas and returned to atmosphere
2. water is heated by the sun into a gas state
3. animals breathe in oxygen and eat carbon. They breathe out CO2
4. water condenses from gas into liquid in clouds.
8. can change nitrogen to a usable form
10. plants absorb nitrogen.
13. the burning of fossil fuels
16. water runs into rivers ponds or oceans