ELi5: is there a gradual shift in Earth’s gravity field and how consistent is it?

Question

From what I understand, air gets thinner the further up you go. This I assume is because Earth’s gravity pulls all the heaviest particles down to its centre. I’m wondering about gravity itself though, is there a gradual shift in the strength of gravity as there is in the consistency of the air, or does gravity apply to the whole field surrounding the Earth up to the very perimeter and then quickly fall off?

In: 9

Answer 1

Gravity falls at square of distance. (This is from center of mass not surface)

Double your distance is 1/4 gravity.