The center of the earth kind of has bubbly things. On MythBusters they tested can a whirlpool suck you down, and they proved you can. It's sort of like that, but instead of staying there and dying the oil gets pulled back to the surface.
(mom's version below)
We filled a glass jar 3/4 full of water, then added about 2" of oil. Then we poured in salt, one tablespoon at a time. The salt pulled some of the oil down with it, but as soon as the salt dissolved the oil floated back up. It reminded me of the lava lamp my grandmother had when I was a child.
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