Crossword Puzzle

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Across
  1. 3. It releases the carbon stored in the bodies of dead organism on land back into the air as CO2.
  2. 6. In _______ , specialized bacteria in waterlogged soil and in the bottom sediments of lake, oceans, swamps, and bogs convert NH3 and NH4+ back into nitrite and nitrite ions and then into nitrogen gas (N2) and nitrous oxide gas (NO2).
  3. 8. The _______________ consist of several major steps. In nitrogen fixation, specialized bacteria in soil and blue green algae (cyanobacteria) in aquatic environments combined gaseous N2 with hydrogen to make ammonia (NH3).
  4. 9. It use some ammonia they produce as a nutrient and excrete the rest to the soil or water.
  5. 11. the basic building block of the carbohydrates.
  6. 12. circulates through water, the Earth's crust, and living organisms in the phosphorus cycle.
  7. 14. _____________ is not taken up by plants and may undergo nitrification.
  8. 15. In some areas, especially in tropical forest, we clear trees and other plants, which absorbs CO2 through_____.
  9. 17. Some participation is converted to ice that is stored in _____________
  10. 18. can be lost from the cycle for long periods when it washes from the land into streams and rivers and is carried to the ocean.
Down
  1. 1. Fertilizer most of this is from the greatly increased use of __________ to grow crops, and the amount released is projected to double again by 2050.
  2. 2. circulates through the biosphere in the sulfur cycle.
  3. 4. During the past 50 years, ______ have increasingly supplemented field research by using laboratory research to set up, observe, and make measurements of model ecosystems and populations under laboratory conditions.
  4. 5. By ______, your doctor needs baseline data on your blood pressure.
  5. 7. This process breaks down (blank) and other complex organic compounds and converts the carbon back to CO2 in the atmosphere or water for reuse by producers.
  6. 8. cycle the _______________ _________, or water cycle, collects,purifies,and distributes the earth's fixed supply of water.
  7. 10. the major reservoir for nitrogen is the_____
  8. 12. cycles The elements and compounds that make up nutrients move continually through air,water,soil,rock,and living organisms in ecosystem and int the biosphere in cycle called _____
  9. 13. produce large amounts of volatile dimethyl sulfide.
  10. 16. Ions can then react with metal ions to form insoluble.