Sublimation-A change from solid to gas without turning into a liquid first like dry ice. See chemistry page . Classification of Matter 1. Mixtures and solutions. Mixtures are two or more substances combined which keep most of their own properties.
Solution is when one substance dissolves into another one.
Naturally occurring substances are called minerals. They may be pure elements or compounds. Composition of Matter 1.The structure of the Atom and its subatomic particles. Neutron, proton, and electron. Protons and Neutrons are made up of two kinds of quarks called up and down.