Solid, liquid, gas ^^
For example, if you have an ice cube you have a solid piece of matter, but if you heat it up it melts and then it's liquid, and after getting hot enough it evaporates and even though you can't see it it's still there, but as a gas.
By the way, what's this have to do with Spanish?
B. Hemos sentido is the right answer
If this is a translation. its dont move as long as the mouth speaks
As Spain began to colonize more and more countries those countries began to develop slang which then resulted in the slang being an everyday thing so then it became part of the language so thats why every spanish speaking country speaks differently.