What is corrosion ?

Explanation

The process in which a metal is destroyed gradually by the action of air, moisture or a chemcial (like an acid) on its surface is called corrosion.
Corrosion is degradation of a material due to reaction with its environment .
The major problem of corrosion occurs with iron , as it is used as a structural material in construction , bridges , ship building .
Iron gets convered by reddish brown flakes when exposed to atmosphere . This is an example of corrrosion.