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Across 2. C6H12O6 + O2 = H20 + CO2 + Energy 6. A scientific study of energy transformations, described laws. 7. The movement of a liquid through a porous material, such as soil particles. 8. Living components of the Biosphere. 11. The romoval of soluble minerals by percolation. 12. An organisim that feeds on detritus. 15. Energy + CO2 + H20 = O2 + C6H12O6 18. A cycle of matter in which nitrogen atoms move from nitrogen gass in the atmosphere, to inorganic forms in the soil, to organic forms in living things, and then back to inorganic forms in the soil and nitrogen gas in the atmosphere. 20. Waste from plants and animals, including their dead remains. 22. The loss of water through plant leaves. 23. An animal that eats both plants and animals. 24. The cycle of matter in which carbon atoms move from an inorganic form to an organic form and then back to an inorganic form. 26. An organism that is incapable of making its own food. 28. The populations of all species that occupy a habitat. 29. The sequence linking organisms that feed on eachother. 30. A representation of the feeding relationships among organisms in a ecosystem.

Down 1. The process in which nitrates are converted to nitrites and then to nitrogen gas. 3. A representation of energy flow in food chains and webs. 4. Species sensitive to small changes in enviromental conditions. 5. A catagory of living things defined by how it gains energy. 9. The process by which non-photosynthetic organisms convert inorganic chemicals to organic compounds without solar energy. 10. The total dry mass of all the living material in a ecosystem. 13. The number of species in a ecosystem. 14. A molecule that has a positive and a negative end. 16. The top level of the region below the ground that is saturated with water. 17. The type of bond that is formed between the positive end of one water molecule and the negative end of another water molecule. 19. A community and its physical and chemical environment. 21. The chemical reaction that occurs when a substance reacts very quickly with oxygen to release energy. 25. A producer. 27. A place or type of enviroment with conditions suitable for the survival of an organism.