What evidence do you have about when some metal objects rust?

Rust takes place when metals get corrode. For example: iron surface get corroded in the presence of water and oxygen and form iron oxide (rust).

The evidences are:

Metals gets oxidized, oxidation state increases which results in corrosion.  

The strength of the object decreases and change in appearance will occur.

lithosphere and asthenosphere

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.