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A rock containing iron has been chemically weathered by if it becomes soft and crumbly and reddish brown in color.
A. abrasion
B. carbon dioxide
C. oxygen
D. acid rain

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ciqarz

Answer:

c. oxygen

Explanation:

Rusting occurs when iron reacts with oxygen in the presence of water. Rusting is an oxidation reaction and is characterized by a reddish brown color.

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