22 September 2016

Maps Mania: America's - and Arizona's - Contaminated Drinking Water Map

Maps Mania: America's Contaminated Drinking Water Map: In 1993 Erin Brockovich brought litigation against the Pacific Gas and Electric Company for the contamination of drinking water with hexavalent chromium, Chromium-6
Use the interactive map accessed in the link to get the testing results for Maricopa County

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Lighting Then VS Now: Fire Before Electricity

3 main sources of light