Question

what do these two changes have in common? rust forming on a metal gate acid rain weathering a marble statue select all that apply. both are only physical changes. both are chemical change. both are caused by heating. both are caused by cooling.

Explanation:

Rust forming on a metal gate is a chemical reaction between iron in the metal and oxygen in the air (oxidation). Acid - rain weathering a marble statue is a chemical reaction where acidic components in the rain react with calcium carbonate in marble. Both are chemical changes and not physical changes. Also, neither is caused by heating or cooling.

Answer:

Both are chemical changes.