Sample Text - What happens to ice cream on a hot day? It melts. Many solids melt. Butter melts. Butter melts if you leav it out in the hot summer sun. It melts if you put it in a hot oven. Glass can be melted and shaped. Even metal melts to a liquid. Whatmakes solids melt and become liquid? Heat. What do you think happens to the liquid when it cools down?