... during its early history. Earth has a crust and upper mantle which together are known as the lithosphere. The lithosphere is divided into multiple tectonic plates, and it is at these boundaries where earthquakes and volcanic eruptions arise...
... flow between 22-14 milliwatt per square metre are still observed today and estimated through studies of the lithospheric flexure; it is hoped that the forthcoming Mars InSight mission might give better estimates for such a value...