Shouldn’t we find that “pebbleicity” of the Earth’s rocks increase as we drill down to levels where the temperature is not hot enough to melt the pebbles? Shouldn’t the extreme outward pressure of the superheated core of earth push the loose pebbles apart?
Gravity holds everything together and some theorize the heat from the radioactive elements at the center of the Earth will melt anything.
As the Earth accreted more and more mass, the heavier elements sank to the bottom of the gravity well.
Some even think the depths of the Earth contain pure gold, platinum, and silver in addition to uranium and other heavy elements................