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It was centrifugal force that sculpted the Earth, and all the planets. That force was greater at the equators, so they all bulge at the equators.
The cavity of our Earth can't have a liquid interior. If it had, the tidal force exerted by the Moon would have induced the liquid interior to bust through any crust just as soon as such crust could have formed by
cooling.
And it can't be full of molten lava because the Earth has a magnetic field. The magnetic fields touch the poles and the Earth serves as a conductor to close the circuit. If the inner core of the Earth had the temperatures which the Molten Core Theory stipulates that it does, then any magnetic properties would be lost as heat destroys magnetism. And it doesn't take too much heat- this point is called the Curie Point. So the existence of the Earth's magnetic field indicates that the core is not molten nor hot.
The moon does not have a magnetic field. Mars does not have a planetary magnetic field. Venus has no magnetic field. Why is that? The answer is because none of them have molten cores, or if they do, they are very small.