Answer:
The correct answer would be the chemical process.
Step-by-step explanation:
The transformation of carbon dioxide into carbonates is a kind of chemical process. A carbonate refers to a polyatomic ion, from the atmosphere carbon dioxide can get transformed to carbonates quiet easily. Dissolution of carbon dioxide into water results in the transformation of carbon dioxide into carbonic acid. This carbonic acid constitutes a carbonate ion.
This carbonate ion can further react with either calcium or magnesium ions to give rise to magnesium carbonate or calcium carbonate that are the carbonic salts of the metals. As it can be seen that each of the processes is taking place chemically, thus, in order to demonstrate the formation of carbonates from carbon dioxide present in the atmosphere, a chemical process would help.