Question

chemical weathering quick check
which substance combines with iron in the presence of water to form rust? (1 point)
oxygen
carbon dioxide
nitrogen
acid

Explanation:

Rust is an iron - oxide. Iron reacts with oxygen in the presence of water in a process called oxidation to form rust. Carbon dioxide, nitrogen, and acid do not directly combine with iron in the presence of water to form rust in the same fundamental way as oxygen does.

Answer:

A. oxygen