Ice is common in the winter around here - falling from the sky, melting and refreezing snow, and frozen creeks and rivers. What exactly is ice? Well, water can exist in three common states: solid, liquid and gas. Ice is just water’s solid form. Solids are made up of matter (anything that has mass and takes up space) that has atoms tightly packed together. Atoms are microscopic particles that make up matter. Solids hold their shape regardless of what container they are in. For example, if you put a piece of wood into a box, the shape of the wood won’t change.