Water I think.
A person is gas,liquid and solid.
A gas is something that is not be liquid or solid
A volcano is made of solid rock.
gas liquid
It is a solid because leafs aren't made of water or gas.
Matter.
A gas is something that is not a solid or a liquid like water.
Carbon is a solid most of the time, but can be made into a liquid, gas, or plasma.
Solid
Liquid
A solution can be made with a solid, liquid, and gas because the solute from the solid and gas can dissolve in the liquid solvent to form a homogeneous mixture. The individual particles of the solid and gas mix with the liquid molecules, allowing for the creation of a solution.
When something solidifies, it turns from a gas or a liquid to a solid. The opposite of something turning from a liquid or gas to a solid would be something turning from a solid to a liquid or gas. Now, there's a word for something turning from a solid to a gas, but it's not in common use; and very few things go straight from solid to gas (dry ice is one example). So the most appropriate answer would be the word for something turning from solid to liquid, which is "liquify".