– basically, why is the structure the way it Is. Moreover, what significance can we attribute to this matter of fact? Thanks!
In: Earth Science
Gravity.
If you have enough matter the internal forces from gravity will deform it to the shape where it can pull it together any more and that is a sphere
If you build a high enough pile of brick the weight of all bricks on top will crush the brick on the bottom.
On a planetary scale, there is no material that can support the weight of what is on top if there is no anything beside it so it can move away, The pressure in the center of the earth is around 3 million times atmospheric and it can crush and deform everything.
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