Humanity is missing something, not knowing about the mantle currents within the Earth. Here is a drawing for explanation:
This is a beginning, as the layers of inner core, outer core and mantle are shown. The same laws of physics are used for the analysis for all the layers. Measurements and physics fit together! In other words: The measured thickness of each of Earth’s layers does match with an arrangement of convection rolls. These rolls are expected to form according to the laws of physics, namely convection within a rotating globe.