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A metal surface becomes dull because of continued abrasion physical change or chemical

A metal surface becomes dull because of continued abrasion physical change or chemical
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A metal surface becomes dull because of continued abrasion physical change or chemical

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User LImbus
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it had to be a physical change unless there a chemical touching the metal surface making it a chemical change .
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User Doj
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A metal surface becomes dull because of continued abrasion. chemical or physical
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