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What caused the eutrophication of Lake Erie?
Although nutrients can be helpful to the ecosystem of the Great Lakes in general, there is a delicate balance that must be upheld. Too much of any one substance (or group of substances) can cause toxic contamination and -- as with Lake Erie -- rapid aging and filling in of the lake from the overgrowth of algae. This causes the depletion (lack of) oxygen, which is needed by the lifeforms in the lake to survive.
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Answered on August 3, 2001