depth to center of earth?

Answer 1

That depends on where you are. The mean radius of the Earth is 6,372.797 kilometers (3960 miles), but since the Earth is oblate, the Equator is farther from the Earth's center of mass than are the Poles. The radius of the Earth's Geoid (hypothetical sea level) is 6,378.137 kilometers (3963 miles) at the Equator and 6,356.752 kilometers (3950 miles) at the Poles.

Since the South Pole lies on the East Antarctic Ice Shelf at an elevation of 2835 meters (9301 feet) and the North Pole is at sea level, the North Pole is the closest point on the surface of the Earth to the center of mass. The summit of Mount Chimborazo in Ecuador is the farthest point from the center of mass at 6,384.404 kilometers (3967 miles).

Answer 2

The depth to the core from on land, around 4000 miles deep.
You can never know the true depth to the core due to the fact that the earth is always shifting. We have no way of actually obtaining the true depth of the cor within the earth.

Answer 3

12,756 K/M is the diameter of earth at middle. Half of the distance is its depth up to center.

Answer 4

Earths radius.