Related by context. Frequent words. (Click for all words.) 81 Earth crust 66 crustal 65 subduction zones 64 tectonic plate 63 subduction zone 60 plate tectonics 60 tectonic 59 magma 59 tectonic plates 59 sedimentary rock 57 tectonics 56 molten rock 55 volcanism 55 atomic nuclei 54 radioactive decay 54 olivine 53 volcanic activity 53 crust 53 Antarctic Ice 53 hydrothermal 52 deformation 52 meltwater 52 seismic waves 52 glacial ice 52 permafrost 52 Antarctic ice 52 sediments 51 Tibetan Plateau 51 volcanic eruptions 51 San Andreas Fault 51 basalt 51 troposphere 51 spacetime 51 coal seams 50 calcite 50 methane 50 seismic activity 50 volcanoes 50 quakes 50 earthquakes 49 volcanic 49 magnetosphere 49 neutron star 49 continental plates 49 sedimentary rocks 48 glaciers 48 magnetic fields 48 atoms 48 Enceladus 48 water vapor 48 geologic 48 interstellar medium 48 lava flows 48 neutrons 48 comet 47 carbonate 47 galaxy clusters 47 seismicity 47 caldera 47 sedimentary 47 vortices 47 andesite 47 nuclei 47 magnetization 46 convective 46 brecciated 46 comet dust 46 gas hydrates 46 subatomic 46 volcanic rocks 46 volcanics 46 Saturn rings 46 earth 46 seafloor 46 glacier 46 oxygen atoms 46 geological 46 hydrogen atoms 45 geologic formations 45 ocean currents 45 volcanic rock 45 silicate 45 ionosphere 45 mid latitudes 45 USGS 45 iridium 45 coal seam 45 updrafts 45 ductile 45 glaciation 45 cosmic ray 45 interstellar dust 45 jet stream 45 lava dome 45 meteorites 45 seamounts 44 active volcanoes 44 electrical conductivity 44 Geologists 44 conductivity 44 cosmic microwave background