How do baseball announcers tell the difference between a slider and a fastball when announcing games?

How do baseball announcers tell the difference between a slider and a fastball when announcing games?

I can more or less tell a curve ball since it has a looping motion. I’m guessing a change up can be determined by the speedometer. New to baseball. Thanks!

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What is the difference between floor hockey and field hockey?

I play floor hockey in a gym recreationally. What is the difference between floor and field hockey?
I obviously know that floor hockey is played on a floor and field hockey is played on a field…. I meant in the actual game.

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