Science Crossword : 2nd Period

4. Shows the amount of energy available at each feeding level in an ecosystem.
5. Features of the environment.
6. A mixture of organic remains, clay, and rock particles.
7. The regions of the surface, atmosphere, and hydrosphere, of the earth occupied by living organisms.
8. Physical rather than not derived from living organisms.
11. The chemical processes by which atmosphere nitrogen is assimilated into organic compounds especially by certain microorganisms as part of the nitrogen cycle.
16. A biological community of interacting organisms and their physical environment.
17. How molecules move between the living and nonliving world.
18. The cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation.

1. Area's average weather conditions over time, including temperature, rainfall or other precipitation, and wind.
2. The production of energy rich nutrient molecules from chemicals.
3. Process of changing from a gas to a liquid.
9. The series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
10. The changing of liquid into a gas.
12. The branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
13. Air that surrounds Earth.
14. A system of interlocking and interdependent food chains.
15. The natural home or environment of an animal, plant, or other organism.
17. A group of people living in the same place or having a particular characteristic in common.