13 sinkholes definition areas where the ground gives

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13. Sinkholes Definition: areas where the ground gives way with little warning Sentence: There are many sinkholes in South America, and no one knows why. 14. Dam Definition: obstruct to block water flow so water can be stored in a reservoir Sentence: As we drove past the large object preventing the river from flowing, my brother yelled dam ! 15. Federal Energy Regulatory Commission Definition: governmental agency charged with renewing licenses for dams Sentence: My friend wanted to renew his dam license, so he went to the Federal Energy Regulatory Commission . 16. Desalination Definition: removal of salt from seawater or water of marginal quality Sentence: Desalination is not only key to drinkable water, but for survival as well. 17. Point sources Definition: discrete locations (factory/sewer pipe) Sentence: The Exxon Valdez’s spill is considered a point source of oil pollution. 18. Non-point sources Definition: multiple cumulative inputs over larger areas Sentence: Fortunately, an individual is not significant enough to be considered a non-point source of pollution.
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