In the movie Erin Brockovich I learnt about Hexavalent Chromium. Hexavalent chromium compounds are a group of chemical substances that contain the metallic element chromium in its positive-6 valence (Hexavalent) state. This relates to the one world because in the one world we had to understand what Hexavalent Chromium is, what Hexavalent Chromium does, and why PG and E were using it.
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