Hear me out, gravity pulls us towards itself. It is determined by the magnitude of mass of that object. As we go deeper in earth, the amount of mass ‘under’ us decreases and so doesn’t the gravity also decrease? Have been thinking about it since I was 12, I am 15 now 🙂
Edit : It wouldn’t be right to thank just one of you by replying as I have seen some other people do but thanks for all the replies, I really appreciate it.
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You are right, gravity does increase (i.e. the force of gravity on a particular amount of mass does increase) as you get deeper in the Earth, up to a certain point. After that it decreases to zero at the center.
The reason for this is that the outer portion of the Earth is less dense, has less mass per unit volume, than the interior of the Earth.
As you know, the force of gravity between two objects depends on the mass of the objects and the square of the distance between them. It is increased by larger mass and decreased by larger separation.
Because of the fact that the crust is significantly less dense than the stuff below it, and the stuff immediately below the crust is also less dense than the core, as it happens, the effect of getting closer to the mass beneath you is larger than the effect of losing the contribution of the portion of the crust that’s now above you (for the first couple thousand kilometers of your imaginary borehole).
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