In which of the following phase transitions is energy released?

liquid to solid

solid to gas

liquid to gas

solid to liquid

please help

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  1. I do not understand why you are having trouble with this. It is the same old lava problem.

    water to ice --- refrigerate=heat out
    ice to steam ---- heat in
    water to steam ---- heat in
    ice to water --- heat in

    heat is energy

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