If a person owns a piece of land, do they own it all the way down to the core of the earth?

Once a person owns a piece of land, it is up to them to find out how to use it, including drilling down in to the earth Of course thel and can be owned up to the core of the earth, but at the moment, we can only reach 12 kilometers at the moment, which is the deepest hole in the earth. Whether or not you can own the land down to it's core, it depends on the landlord's choice of you digging that deep. If you are the landlord, then dig away. XD

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Most of the land is used for housing/commercial uses