Water, water everywhere
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Across: 1. A barrier across flowing water that obstructs, directs or slows down the flow, often creating a reservoir, lake or impoundment. 3. An artificial channel that is constructed to convey water from one location to another. 7. Contains low concentrations of dissolved salts and other total dissolved solids. 8. The introduction of substances or energy into the environment, resulting in deletrious effects of such a nature as to endanger human health, etc. 11. 2.4 billion people around the world do not have access to this improved facility. 12. Containing salt or salts. 14. A biological community of interacting organisms and their physical enviornment. 15. Energy sources that come out of the ground as liquids, gases and solids. 16. Having bounds, ends, or limits. 17. The outermost part of the planets shell.
Down: 2. A general term for the medical condition caused by improper or insufficient diet. 4. All humans require _______, fresh water for drinking and sanitation. 5. Water located beneath the ground surface in soil pore spaces and in fractures of geological formations 6. Any product of the condensation of atmospheric water vapor that is depsited on the Earth's surface. 9. An underground layer of water-bearing permeable rock or unconsolidated materials from which groundwater can be usefully extracted using a water well. 10. The presence in the environment, or the introduction into it, of substances. 13. A disease, ailment or malady.
