What Is the Galactic Fountain Model

What is the galactic fountain model?

A) the idea that there is a lot of interstellar water vapor
B) the theory that the Milky Way is a spiral galaxy and looks like a whirlpool from above
C) the theory that hot,ionized gas blows out of the galactic center like a jet or fountain
D) the theory that hot,ionized gas blown out of the galactic disk and into the halo by superbubbles cools down and falls back into the disk
E) none of the above

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