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Since your questions are roughly the same, I'll answer them both at once. Gravity and magnetism are not the same thing. In fact, they are completely separate forces. Gravity is a force that acts between any two objects with mass. No matter what they are made of, both objects get pulled towards each other just because they have mass.
Our planet is shrinking, says a Russian geologist. Since its early days the Earth’s average radius has reduced by 585 kilometers.
Vyacheslav Orlenok, professor of geology at the Kant Russian State University in Kaliningrad, compared ancient relief structures to those of today, he reports in a paper.
He says 4.5 billion years ago, when Earth’s surface had just started to solidify, the little blue ball was a bit bigger. Its average radius was 6,956 km, and has since reduced by 585 km.