air gets trapped in the juice when shaking to make bubbles full of gas. the bubbles are really small because when shaking, the gas goes in all over the juice so a little bit gets trapped in each little bubble and because there is quite a lot of gas (therefore lots of little bubbles) they float to the surface and the teeny tiny little bubbles build up to create a foam (foam made mostly of the juice on the surface of the bubbles. the juice bubble surface is so thin, it goes see-through and with the gas in between the bubbles distorts colour and light which makes it sometimes look white).
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cause it comes from your moms p3n!s
(Alante2010) Because milk isn't the only thing in the carton. Air is also inside, and makes bubbles as it breaks through the milk's surface. PS: whoever answered this question before me is dumber that the shoes on my feet.
The gravity and the laws of physics effect the "swirling" motion of milk when pour out. Hope this helped. :)