Related by context. Frequent words. (Click for all words.) 74 crustal 68 tectonics 67 tectonic plate 65 plate tectonics 64 Earth crust 64 volcanism 62 subduction zone 60 earth crust 60 tectonic plates 60 geologic 59 volcanic 58 subduction zones 58 deformation 56 hydrothermal 55 geological 55 sedimentary 54 San Andreas Fault 54 seismicity 54 magma 53 volcanic activity 53 seismic activity 53 glaciation 53 volcanic eruptions 52 volcanoes 51 Volcanic 51 sedimentary rocks 51 earthquakes 51 discontinuous 50 stratigraphy 50 sedimentary rock 50 volcanics 50 caldera 50 glacial 49 seismic 49 basalt 49 seismic waves 49 geologically 49 molten rock 49 oceanic 48 quakes 48 Tibetan Plateau 48 eruptive 48 volcanic rocks 48 sediments 48 atmospheric circulation 47 faultline 47 metamorphic 47 upwelling 47 hydrothermal alteration 47 Precambrian 47 lava flows 47 intrusive rocks 46 landforms 46 Ordovician 46 magnetosphere 46 paleo 46 stratigraphic 46 dynamical 46 convective 46 mid latitudes 46 isotopic 45 mafic 45 seismology 45 granites 45 magnetization 45 lithologies 45 Geologic 45 ultramafic 44 neutron star 44 breccia 44 nucleation 44 equatorial 44 anthropogenic 44 seafloor 43 gravitational 43 Iapetus 43 topography 43 atmospheric 43 seismologists 43 crust 43 shear zones 43 geology 43 gabbro 43 Antarctic Ice 43 epithermal 43 glacial ice 43 permafrost 43 perturbations 43 geochemical 43 active volcanoes 43 deforming 43 discontinuities 43 unconformity 43 convection 42 massive sulphide mineralization 42 geophysicists 42 glaciers 42 overlying 42 cataclysmic 42 continental plates 42 Mesozoic