earth's core, section layers earth and sky

and boil burn center cloak composition core crust earth earthquake energy exosphere field fire geology geomagnetic geomagnetism geophysics geothermal ground heat hot inner interior ionosphere iron layers liquid lower magma mantle map melt mesosphere moving oceanic outer physics plate plates section seismic seismology sky split stratosphere study tectonic tectonics terrestrial the training troposphere upper volcanoes waves world