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Rust on weathered rocks is caused by the process of oxidation. Oxidation is a process of chemical weathering that occurs when oxygen combines with minerals in rocks. rust occurs when oxygen combines with iron in rocks to form the reddish brown iron oxide.

Answer: The correct answer is oxidation.

Explanation:

Rust is a reddish-brown colored compound which is formed by the oxidation of Iron to form ferric oxide. The formula for this chemical compound is [tex]Fe-2O_3[/tex]

Oxidation is defined as the reaction in which addition of oxygen takes place.

The reaction for the formation of rust is given by the equation, we get:

[tex]4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)[/tex]

By Stoichiometry,

4 moles of iron metal reacts with 3 moles of oxygen gas to form 2 moles of ferric oxide.

Hence, the correct answer is oxidation.

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