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The Grand Canyon is contaminated with mercury
Researches have found significant mercury and selenium contamination in the Grand Canyon. Credit: Wikipedia Anthropogenic sources can contaminate a water source with methylmercury. When eaten by fish, the mercury levels increase as it moves up the food chain in a process known as biomagnification. Credit: Wikipedia

Researches have found significant mercury and selenium contamination in the Grand Canyon. Credit: Wikipedia
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Researches have found significant mercury and selenium contamination in the Grand Canyon. Credit: Wikipedia