terça-feira, 10 de maio de 2011

Community Helpers: Environmental Scientist (Accessible Preview)

Disponível em http://youtu.be/UILWq7jfgu4

An environmental scientist who provides clean water to the city of Philadelphia explains how this water is used in homes, parks, and swimming pools and to fight fires. Shows that river water from rain and farm runoff is dirty and needs to be purified before people can use it. Visits the Fairmount Water Works and explains how water is brought to such plants, purified, and sent on to homes and factories. Also, emphasizes why caring about the health and safety of rivers are important.

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