Related by context. Frequent words. (Click for all words.) 73 subduction zone 67 Earth crust 65 subduction 65 earth crust 62 crustal 62 tectonic plate 62 plate tectonics 60 tectonics 59 volcanism 58 tectonic 56 tectonic plates 56 olivine 55 quakes 55 magmatic 55 magma 55 volcanoes 54 seamounts 53 earthquakes 53 hydrothermal vents 53 mid latitudes 52 Tibetan Plateau 52 diatoms 52 hydrothermal 51 sedimentary rocks 51 sediments 51 seismic waves 51 volcanics 51 molten rock 51 Antarctic Ice 51 glaciers 51 caldera 51 volcanic activity 50 San Andreas Fault 50 sedimentary rock 50 nucleation 50 landforms 50 upwelling 50 geophysicists 50 seismicity 50 intrusive rocks 50 seismic activity 50 lava flows 50 atmospheric circulation 49 continental plates 49 vortices 49 deformation 49 temblors 49 sedimentary 48 shear zones 48 Tsunamis 48 geologic 48 terrestrial planets 48 seismically active 48 geologically 48 glaciation 48 tsunamis 48 permafrost 48 Seismologists 48 magnetization 48 volcanic eruptions 48 calcite 48 single celled organisms 48 mafic 47 Precambrian 47 pyroclastic flows 47 Antarctic Peninsula 47 active volcanoes 47 mass extinctions 47 carbonate 47 archaea 47 magnetic anomalies 47 seismologists 47 atomic nuclei 47 stratigraphy 47 rocky planets 47 hydrothermal alteration 47 earth tremors 47 galaxy clusters 47 volcanic 46 oceanic 46 meltwater 46 spacetime 46 radioactive decay 46 glacial ice 46 magnetosphere 46 seismology 46 seismometers 46 Ordovician 46 geochemical anomalies 46 orebodies 46 polar regions 46 asteroids 46 silicate 46 organic molecules 46 volcanic rocks 46 andesite 46 basalt 46 Proterozoic 46 troposphere 46 atoms 46 equatorial Pacific