rust on an artifact is an example of

A. chemical decomposition
B. chemical preservation
C.physical decomposition
D.physical preservation

C. physical decomposition

The correct answer is A. chemical decomposition.

When an artifact, such as metal, develops rust, it goes through a chemical reaction known as oxidation. Rust is formed when iron or steel comes into contact with oxygen and water. This reaction leads to the formation of iron oxide, which is the reddish-brown substance we commonly refer to as rust.

Chemical decomposition refers to the breakdown of a substance into simpler components due to a chemical reaction. In the case of rust, the iron in the artifact reacts with oxygen and water, resulting in the formation of rust and the decomposition of the original metal.

To determine the correct answer, we need to understand the process and characteristics of rust formation. Understanding the properties and behaviors of different substances helps us categorize whether a particular phenomenon or change is a result of chemical or physical processes. And in this case, rust on an artifact is an example of chemical decomposition or oxidation.

A. Chemical decomposition

Rust is a chemical compound that forms when iron or steel is exposed to oxygen and moisture. It is a result of a chemical reaction known as oxidation, where iron atoms combine with oxygen atoms to form iron oxide. Therefore, rust on an artifact is an example of chemical decomposition, as the iron or steel is deteriorating and being transformed into a different chemical compound (iron oxide).