Unit 1 Crossword Puzzle

3. The process in the nitrogen cycle that converts nitrates to atmospheric nitrogen gas.
7. In the phosphorus cycle, plants absorb ________ from the soil.
8. ___________ is not usable for plants so it must be converted to usable forms of nitrogen in the nitrogen cycle.
11. Combustion releases _______ into the atmosphere.
12. In terms of levels of organization, a __________ consists of different living organisms.
13. In the water cycle, water goes from the atmosphere back to Earth through __________.
14. In an energy _______, only 10% of energy goes from each trophic level to the next.
15. Tundra and rainforests are examples of ______. These typically have similar weather and climate patterns.

1. The trophic level that obtains energy through the process of photosynthesis.
2. Through the process of _________, water goes from the oceans to the atmosphere.
4. An ________ consists of both abiotic and biotic factors.
5. Wolves at Yellowstone National Park are known as _____________ because their absence or presence has a huge effect on the food web.
6. Phosphorus stored in rocks go through the process of __________.
9. _________ are organisms that obtain energy by feeding on dead organisms.
10. Nonliving things in an ecosystem are known as ______ factors.