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Across 6. returning water to the enviroment 11. the development of a community on exposed rock 12. the first organisms that grow in an area 13. the process of burning fuel 14. a gradual development over time 15. bacteria in the soil are able to change nitrogen into gas 16. the movment of water through oceans, the enviroment, and the atmosphere

Down 1. the process of plants getting carbon to make sugars 2. the movement of carbon in the enviroment to living things and back again 3. water stored under-ground 4. changes into a vapor 5. succesion grown after a natural disater 7. the movement of nitrogen in the enviroment to living things and back again 8. when sugar molecules are broken down to release energy 9. the breakdown of dead materials 10. falls from the sky in a form of rain,sleet,snow,or hail