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Physics, 05.10.2019 13:00 asims13

Alabel for a plant is made of copper. when it is first put in a garden, it is bright and shiny. after a few months, the label has a dull, greenish color. when you rub your finger over the surface, some soft material rubs off. what happened to the copper?

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Alabel for a plant is made of copper. when it is first put in a garden, it is bright and shiny. afte...

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