Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. condition changing (processes)
6. deterioration
7. degradation

Anotations

Scope note:

Biologically mediated deterioration that includes molecular changes to a material such that characteristic properties of the material are no longer evident. For loss of utilitarian or physical characteristics of a material caused by bacteria or other microorganisms, use 'biodeterioration.'