Piper's Science Crossword

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Across
  1. 4. The movement of carbon from the atmosphere into living organisms, then into the earth, and finally back to the atmosphere.
  2. 7. When water leaves the earth through evaporation and enters the atmosphere as a gas called water vapor.
  3. 9. Since all living things need nitrogen to live and reproduce, this causes nitrogen to cycle through the environment through the Nitrogen Cycle.
  4. 10. When dead organisms are decomposed by organisms such as bacteria and fungi.
Down
  1. 1. When the water in the clouds eventually returns to the earth by falling as precipitation.
  2. 2. A process that takes oxygen from the atmosphere and releases carbon dioxide.
  3. 3. Fuels such as gasoline, oil, and coal contain large amounts of carbon.
  4. 5. When water vapor cools and becomes liquid again in a process called condensation.
  5. 6. The process by which a plant uses energy from the sun to turn carbon dioxide and water into a sugar called glucose.
  6. 8. The movement of oxygen from the atmosphere into living organisms and back to the atmosphere.