RE: Science Challenge # 2 - What is Aluminium Oxide?

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Science Challenge # 2 - What is Aluminium Oxide?

in steemstem •  7 years ago 

Air, Scratches ! :D

steemstem
7 years ago by

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      ·  7 years ago 

    1.only from oxygen in the air

    It is kind of a layer that if damaged mechanically, repairs itself later.

    so, it actually re-appears thanks to scratches
    =))

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        ·  7 years ago 

      Yeah. Lol.. Then again, they ruin more of the materials :D

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