For reference, Earth's interior gravitational acceleration: http://en.wikipedia.org/wiki/File:EarthGravityPREM.jpg http://en.wikipedia.org/wiki/File:EarthGravit

For reference, Earth's interior gravitational acceleration: http://en.wikipedia.org/wiki/File:EarthGravityPREM.jpg http://en.wikipedia.org/wiki/File:EarthGravityPREM.jpg As you see, gravity gets stronger up to a maximum in the outer core, because the core is much more dense. But the issue here is not about spherical Earths at all. Earth deviates significantly from a spheroid and even an ellipsoid shape-wise and gravity-wise. Just saying "location X lies closer to the center of the earth and therefore experiences less gravity" is somewhat irrelevant here.