Use this one-page states of matter worksheet in your upper elementary or middle school physical science unit to review, practice, or assess the states of matter. About the worksheet:Students start by defining solid, liquid, and gas and then describe the particle movement in each phase of matter. Next, they draw the particle arrangement in solids, liquids, and gases. In sentences they predict what they think will happen to the particles in a solid if it is heated. The final three questions ask