What is "upflowing"

Usage examples of "upflowing".

Hess’s original proposal was that the upflowing material at the ridges pushes the plates apart, but later findings have made this improbable, or at least, insufficient in itself.

So was I, but I kept struggling to ease open, force open those channels, to let that upflowing well of molten order, imbued with the fire of chaos, seethe toward the twilight, toward the ancient road where we struggled.

Within moments I could make out the melted ice of the hole passing a few hundred feet away through the upflowing vapour.