Phase Changes, Changes from one state of matter to another., Melting, A solid changes into a liquid because it gains heat., Endothermic, A process that absorbs heat from the surroundings., Exothermic, A process that releases heat to the surroundings., Sublimation, A solid changes directly into a gas without becoming liquid first., Freezing, A liquid changes into a solid because it loses heat., Deposition, A gas changes directly into a solid without becoming liquid first., Evaporation, A liquid changes into a gas at its surface., Condesation, A gas changes into a liquid when it loses heat., Matter, Anything that has mass and takes up space.

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