solid - a state of matter that has a fixed shape, liquid - a state of matter where it's shape changes to match the shape of its container, gas - a state of matter that does not have a fixed shape, melting - the process in which a solid changes into a liquid, freezing - the process in which a liquid changes into a solid, evaporation - the process in which a liquid changes into a gas, condensation - the process in which a gas changes into a liquid,

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