This is known as solidifying, or freezing.
freezing
melting
Changing a chocolate from soild to liquid requires the absroption of energy.
melting
Soild
the lower mantle is a soild.
Soild
Changing the liquid state to solid state is known as freezing, changing from solid state to liquid state is known as melting and changing from liquid or solid state to gaseous state is known as evaporation.
Toothpaste is a liquid.
Liquid.
evaporation
Freezing.
When any liquid changes to a solid it as too be frozen or cooled to such a state where the molecule join together to make one uniform state (aka soild)