Does the rinbow disappear?

You'd better watch out, because more likely than not, he'll be back.

When you ask about disappearing, are you talking about just disappear so no one will know where you are? If it is all you can do is move to another state without no one knowing you are moving. Maybe...

I don't think that's possible yetIf you have a smokemaker and a trap door in the floor you can use the smokemaker and appear the illusion of dissapearing.

Yes

Dinosaurs disappeared when a meteorite hit the Earth and worldwide fires started. as a result of that smoke and dust blocked the sun for many years. Because of that, plants died. So... plant eating...