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Across 1. water in the soil or rock below Earth's surface 4. waste from plants and animals, including their dead remains 6. the boundry between the layer of soil that is saturated with water, and the unsaturated soil above it 9. the biological or living components of the biosphere 10. a group of organisms that look alike and can interbreed under natural conditions to produce fertile offspring 17. the number of species in a certain area 19. term used to describe the extent to which a surface can reflect light that strikes it 20. the process of nicorporating CO2 into carbohydrate molecules 21. the non-living components of the biosphere. they include the chemical and physical factors 23. the movement of a liquid through a porous material, such as soil particles 24. the type of bond that is formed between the positive end of one water molecule and the negative end of another water molecule 25. the process by which non-photosynthetic organisms convert inorganic chemicals to organic compounds without solar energy 26. the removal of soluble minerals by percolation 27. a heterotroph; an organism that must eat producers or other consumers to survive

Down 2. any system with constant change in which the components can adjust to the changes without disturbing the entire system 3. a material used to restore nutrients to plants. 5. a category of living things defined by how it gains its energy 7. zane 8. the soil layer beneath the litter, composed of small particles of rock mixed with humus 11. an organism that can synthesize organic compounds from inorganic chemicals without using solar energy 12. the process in which nitrates are converted to nitrites and then to nitrogen gas 13. an organism that is incapable of making its own food, and so must feed on other organisms to gain energy 14. the total dry mass of all the living material in an ecosystem 15. two processes in which atmospheric or dissolved to nitrogen is converted into nitrate ions 16. cultivation of a single species 18. the land that drains toward a lake of other body of water 22. the narrow zone around earth that harbours life.