earth's hidden layers: crust to molten core.

crust mantle outer core continental oceanic silicate minerals plate tectonics liquid iron nickel magnetic field convection solid sphere pressure temperature earth 39aph39 interior geology rock cycle tectonic plates lithosphere asthenosphere magma seismic waves structure subduction zones earthquakes volcanism geothermal energy heat coremantle boundary moho discontinuity plumes geodynamic processes composition ironnickel alloy dynamic formation seismology geological activity transfer layers dynamics graphic nature