This bottle is made from a solid. Inside the bottle is a liquid. Which one of these is also a liquid inside a solid?

What are things made from? They can be solid, like a brick, or they can be made of liquids or even gasses. Some things, like rock and wood, are natural. But other things have been made. The chair you are sitting on may be made of wood, but it has been made in a factory. Many things are made from lots of different materials.