A solid is not a solid when you change the shape and becomes different.
A piece of butter is a solid in solid.
a solid is a solid because the molecules that are in the object are closely compact with each other. they do not move but the do vibrate.
a solid is something that takes up a fixed amount of space (takes up space e.g. a table or a chair) and has no air in it
Respectively are Calcium cabonate, Tungsten and Diamond (most probably)