Glass is a ceramics but ceramics is not a glass. it is like saying all bugs are insects but all insects are not bugs... get it
No, two separate things.
As far as anyone can tell... yes. There has not yet been found an example of glass that is not glass.I say nay, glass is melted sand, so glass is sand.
Well, ceramics is usually made from clay such as porcelan or teracota. glass ceramics is made from glass...