What is salt composed of Maria wondered she took a microscope from the cabinet in her science classroom,put some salt on the microscope from the cabinet in her classroom put some salt on a microscope slide and focused on the salt she saw tiny squares on the slide I guess salt is made only of crystals is Maria correct in her conclusion. A yes salt is composed of crystals B no salt like all matter is composed of atoms C no salt like all matter is composed of compounds D no salt like all matter is composed of molecules