Subduction zones Earth rotation etc 1 Earthquakes 1 Geology, Structural 1 Geomagnetism 1 Glaciations 1 Hot spots 1 Island Arcs 1 Mantle chemistry 1 Metamorphism 1 Mid ocean ridges 1 Petrography 1 Plate tectonics 1 Rationale 1 Ridges 1 Rock creep 1 Rock magnetization 1 Seismic exploration 1 Terrestrial heat 1