Pollution - when something harmful enters the environment, Contaminate - to poison or make something unclean, Crisis - an intense and challenging time, Reservoir - a pool of water used for a water supply, Evaluate - carefully check, Primary Source - first- hand information - Straight from the source, Secondary Source - second-hand information- From someone who researched an event, Paraphrase - to put in your own words, Toxic - harmful to living things,

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