Final answer:
Marble is a compound known as calcium carbonate (CaCO3), which consists of two or more different types of atoms chemically bonded together, with a Ca:C:O ratio of 1:1:3.
Step-by-step explanation:
Marble, which is primarily comprised of the compound calcium carbonate (CaCO3), is indeed a compound because it contains two or more different types of atoms that are chemically bonded together.
In the case of calcium carbonate, the ratio of calcium (Ca) to carbon (C) to oxygen (O) atoms is 1:1:3, as denoted by its chemical formula.
An element, by definition, contains only one type of atom, while a compound consists of two or more elements in a fixed ratio that are bonded together through different types of chemical bonds.