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m_a_m_a [10]
3 years ago
9

About 21% of Earth's atmosphere is composed of oxygen. Oxygen can combine with other substances. The chemical reaction

Biology
1 answer:
frozen [14]3 years ago
7 0

Answer:

Oxygen has chemically reacted with minerals in the rock; oxidation has

occurred.

Explanation:

Iron in the rock has oxidized, hence the rusty color.

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