Solid is when something that is difficult to compress but it can still vibrate. Atom on the ice can make the ice float. It floats because the way the atoms are positioned. A cube of ice is like solid and if you put it in a container and it melts then it can be liquid. And if it melts it could change to its own shape. Matter is made up with little particles like a lego block.
Solids, liquids and gases — Science Learning Hub