Unit 1 Crossword Puzzle

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Across
  1. 3. The process in the nitrogen cycle that converts nitrates to atmospheric nitrogen gas.
  2. 7. In the phosphorus cycle, plants absorb ________ from the soil.
  3. 8. ___________ is not usable for plants so it must be converted to usable forms of nitrogen in the nitrogen cycle.
  4. 11. Combustion releases _______ into the atmosphere.
  5. 12. In terms of levels of organization, a __________ consists of different living organisms.
  6. 13. In the water cycle, water goes from the atmosphere back to Earth through __________.
  7. 14. In an energy _______, only 10% of energy goes from each trophic level to the next.
  8. 15. Tundra and rainforests are examples of ______. These typically have similar weather and climate patterns.
Down
  1. 1. The trophic level that obtains energy through the process of photosynthesis.
  2. 2. Through the process of _________, water goes from the oceans to the atmosphere.
  3. 4. An ________ consists of both abiotic and biotic factors.
  4. 5. Wolves at Yellowstone National Park are known as _____________ because their absence or presence has a huge effect on the food web.
  5. 6. Phosphorus stored in rocks go through the process of __________.
  6. 9. _________ are organisms that obtain energy by feeding on dead organisms.
  7. 10. Nonliving things in an ecosystem are known as ______ factors.