A solid is not a solid when you change the shape and becomes different.
A piece of butter is a solid in solid.
solid-solid
Sublimation is the conversion from solid directly to gas, so the particles of a solid that sublimes would change into a gas.
Cube is 3D while square is 2D.cube is used to describe solid shape in 3Dwhile square is used to describe the shape of the surface which is only 2D