Usually kids movies are 3D but like Edgar said it will say at end of the title plus it cost more for 3D movies.
It depends. All major anticipated movies have the option of being in 3D. Some even alternate between 2D and 3D. If you are looking for a 3D movie, it will say it after the title. If it doesn't, assume it's 2D.
You wear 3D glasses for 3D movies
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