Q:Fact 1: Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone. Fact 2: Carbon dioxide dissolved in rainwater forms carbonic acid. Given the two facts above, answer the question "What chemical creates a cavern?" with the following options: - carbonic acid - heating liquids - hydrogen and oxygen - aqueous solution - salt - oxygen - hydrogen - flow of electrons
A:
carbonic acid