Comment Re:9.81 m/s^2 at sea level (Score 1) 95
9.81 m/s^2 at sea level is how I was taught.
Anything above sea level is less and below is more.
This is incorrect.
If you are standing at sea level in a cave deep inside a mountain, acceleration will be less than 9.81 m/s^2. That's the point of the article. The mountain above you is pushing down into the mantle, displacing denser mantle material, so between you and the core is less mantle than if you were on a boat in the sea.