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textoFiltroFichatipo de documento Earth Sciences and Environment - Lesson/Lesson plan
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Pollutants and acid rain from outside the region are deteriorating the air quality and having negative effects on the life in the Great Smoky Mountains National Park.
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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