For example stainless steel is practically insoluble in water.
sounds
Rubber and glass which become softer as they are heated are examples of crystalline solids
They are all solids.
This is an odd example. Anything that is NOT solid earth is a non-example. So, a bird is not solid earth.
I can only tell you that gases are does not have a difinite shape and volume . E.g air / nitrogen / carbon dioxide / water vapour / . . .