* Depth from the surface to the center of the Earth: This is about 6,371 kilometers.
* Depth of the Earth's crust: The crust is the outermost layer of the Earth, and its depth varies depending on whether you are on a continent or an ocean. The continental crust is typically about 30-50 kilometers deep, while the oceanic crust is only about 5-10 kilometers deep.
* Depth of the Earth's lithosphere: This is the rigid outermost layer of the Earth that includes the crust and the upper part of the mantle. It is about 100 kilometers deep.
To give you the best answer, please clarify what you mean by "depth of the Earth's surface."
