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Across 2. water which collects as droplets on a cold surface when humid air is in contact with it 5. the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms 8. the envelope of gases that surround the earth 9. the rigid outer part of the earth, made up of the crust and upper mantle 10. the process of something wearing down over time by water, ice, or wind 13. the quality or degree of containing salt (2 Words) 15. the impact of a person or community on the environment (2 Words) 18. a colorless, unstable toxic gas with a pungent odor and powerful oxidizing properties (2 Words) 19. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere 22. the ability to be maintained at a certain rate or level (2 Words) 24. of or found in fresh water, not of the sea 25. the layer of the earth's atmosphere above the troposphere, extending to about 32 miles above the earth's surface

Down 1. the cool, lightweight, outermost layer of the earth's surface that floats on the soft, pliable underlying layers 3. this explores topics like ecology, geology, and biology to understand environmental issues (2 Words) 4. the thick layer of the earth beneath its outer crust 6. the process of turning liquid into vapor 7. the branch of biology that deals with the relations of organisms to one another and their physical surroundings 11. the action or process of precipitating a substance from a solution 12. the genetics, species, and ecological diversity of the organisms in a given area 14. the science or practice of farming, including cultivation of the soil for the growing of crops and rearing of animals to provide food, wool, and other products 16. earth's outermost layer, or lithosphere, is broken into large rocky plates (2 Words) 17. the lowest region of the atmosphere that extends from the earth's surface 20. the presence or introduction of a substance or thing that has harmful or poisonous effects into the environment 21. the emission of energy as electromagnetic waves or as moving subatomic particles 23. the innermost geologic layer of the earth (2 Words)