Bio corrosion refers to the degradative process that acts on metals, minerals, and rock. It involves the interaction between microorganisms and the material, leading to its deterioration. These microorganisms, such as bacteria, play a crucial role in the corrosion process by producing corrosive agents or altering the surrounding environment. The term "bio corrosion" encompasses various mechanisms, including the action of sulphur oxidizing bacteria, iron bacteria, and sulphate reducing bacteria, among others. Therefore, bio corrosion is the correct answer as it encompasses all these degradative processes.