Nutrient Cycles Crossword!

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Across
  1. 3. What is present in all four cycles (carbon, water, nitrogen, Phosphorus).
  2. 6. Natural Source of CO2.
  3. 7. Dead plants and animals burned to release CO2.
  4. 9. Cycle in which CO2 moves from the atmosphere to plants through photosynthesis and animals make more CO2 through respiration.
  5. 10. A nutrient whose supply limits productivity.
  6. 13. Burning fossil fuels, manufacturing, oil, electricity generation, and vehicles all release this into the atmosphere.
  7. 14. Phosphorus moves from the soil to plants to animals to their waste and then back to the soil.
  8. 15. Humans allow fertilizer runoff into waterways adding this to the environment.
  9. 16. Too much phosphorus can lead to this.
  10. 17. A complex system of continuous movement of water on the earth.
  11. 18. Process by which nitrogen goes though four steps; nitrogen fixation, decay, nitrification, and denitrification.
Down
  1. 1. Process used by plants to make sugar and oxygen.
  2. 2. Forms of matter pass from organism to organism and from one part of the biosphere to another.
  3. 3. Main regulator of CO2 (dissolves easily in it).
  4. 4. Our atmosphere is made of 78% of this gas.
  5. 5. A type of bacteria that makes nitrogen usable by other organisms.
  6. 8. Found in rocks and minerals and makes up DNA.
  7. 11. Snow, hail, rain, sleet, and hail are all examples of what?
  8. 12. Evaporation, condensation, and precipitation are the 3 major steps in the _________ cycle.
  9. 15. What organisms need to survive.