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Across 4. a substance that provides nourishment essential for growth and the maintenance of life. 7. converting a liquid to gas 11. Process that removes carbon from the air 13. Nitrogen Compound. Usable by living things NO3 15. water that fills the cracks and spaces in underground soil and rock layers 17. release carbon into the atmosphere from melted carbonate rocks (2 Words) 18. water that flows over the ground surface rather than soaking into the ground 19. Evaporation of water from the leaves of a plant 20. The most important organism in the carbon cycle 21. Part of all cycles. Break down of dead organisms. Returns nutrients back to the cycles. 22. Name for the stuff that makes up absolutely everything in the universe 23. Burning of carbon based materials (wood, gasoline, coal) to obtain energy to do work. Release CO2 as a byproduct

Down 1. Nitrogen Compound. Usable by living things NO2 2. circulation of water from the oceans to the atmosphere and back to the oceans by way of evaporation, runoff from streams and rivers, and groundwater flow (2 Words) 3. Produced during carbon cycle when carbon from dead organisms is compressed deep within earth after millions of years (2 Words) 5. conversion of nitrates in the soil by bacteria into nitrogen gas 6. The most important organism in the nitrogen cycle 8. converting a gas to liquid (forms clouds) 9. Process that living things use to convert organic compounds into CO2 (2 Words) 10. Conversion of nitrogen gas into usable form for plants by special nitrogen-fixing bacteria (2 Words) 12. he transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere (2 Words) 14. Any form of water that falls from clouds and reaches Earth's surface. 16. movement of carbon in different chemical forms from the nonliving environment to the living environment and then back to the nonliving environment (2 Words)