Full milk cartons are sturdy, even though
they're almost full of milk. If the container is
filled full of liquid, there's no place for the
liquid to slosh around. That's how it is with
the liquid in the earth.
I recommend you to read the following article:
It has a cool picture fairly far into the article
that shows how the very center of the earth is
solid iron, and then there's a big liquid
layer around it. The article says we know about
the liquid because of earthquakes! I suppose we
also get a clue about the liquid from volcanoes.
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