Who Decided?

I often wonder, who decided?  Who decided that the colour of the sky should be called blue?  That the colour of the grass should be called green?

Who decided that the planet is called Earth?  That the pieces of hard substance on the ground should be called rocks?  That the wet stuff that lives in large areas should be called water? And ocean?

Not only who decided, but how did they get everyone else in the world to agree to call it what they wanted to call it.

Who named it snow?  Rain? Sleet? Hail?

I am sure there is an archaeologist or anthropologist or some sort of ologist, somewhere, maybe can tell me the theories.  In fact I am friends with several who can probably tell me the theories.

But I don’t want theories.  I want definite answers.  I want to know.  Everything.

Who decided?