Everywhere you look, you see rocks.
Rocks rocks rocks.
You can’t throw a rock without hitting a rock.
The idea of differentiation is that things with greater density will be subjected to greater gravitational attraction. Leaving aside that you could leave a uranium ball the size of the Queen Mary in Central Park and thousands or zillions of years from now, whatever was beneath the uranium ball would still be beneath the uranium ball, there is no gravitational attraction for anything at the center of the earth. (The center of the earth is essentially surrounded by a uniform mass field.) So if differentiation had any validity the heavy/dense stuff would work its way to a tennis ball like shell something like a third (I'm guessing. I didn't do the math.) of the way down from the surface toward the center.
ML/NJ
Snips and snails and puppy-dog tails,
That’s what Mars is made of.
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