Foaming
noun, verbal noun, の adjective
The departure of bubbles is when bubbles leave something, like a mouth. That's why this is foaming.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
発泡スチロールはこの袋に入れてもらってもいい？他のゴミとは分別して捨てるんだよね。
Could you put the styrofoam in this plastic bag? We throw away the rest of the garbage separately.