Essay

How does a solid become a liquid.
Solids turn into liquids through temperature change.In the case of water solid ice turns into liquid  water because the temperature rises above 0 degress.
The heat energy always moves from a warm place to a cold place. When you get a solid hot the molecules go faster and harder, until they start breaking apart and moving around. Thats when a solid melts and becomes a liquid. 
One type of solid is an crystalline solid. The particles in a crystalline solid have a regular repeating pattern.
Some solids turns into liquids depending their density.
Freezing.
The process in which a substance changes from a liquid to a solid is called freezing. When a liquid is cooled, the average energy decreases.
The amount of heat removed is great enough than the attractive forces between molecules that are together, and the liquid freezes into a solid.
The temperature of a freezing liquid, remains constant, even when more heat is removed.