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textoFiltroFichatipo de documento Earth Sciences and Environment - Lesson/Lesson plan
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Lake Michigan is one of the five Great Lakes. Pollution has been a problem for decades, but people are trying harder than ever to clean up the lake and to keep it from becoming further polluted.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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Fecha publicación: 1.10.2015
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