Answer:
it is a chemical process
Step-by-step explanation:
rusting is the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.
The chemical formula for rust is Fe2O3 and is commonly known as ferric oxide or iron oxide. The final product is a series of chemical reactions simplified below as- The rusting of the iron formula is simply 4Fe + 3O2 + 6H2O → 4Fe(OH)3. The rusting process requires both the elements of oxygen and water.