Related by context. Frequent words. (Click for all words.) 76 molten rock 72 lava 66 lava flows 62 Earth crust 60 volcanic activity 59 earth crust 59 hydrothermal 59 plate tectonics 59 caldera 59 volcanoes 58 volcanic 57 water vapor 56 lava dome 56 Enceladus 56 lava flow 55 volcano 54 neutron star 54 volcanic rock 54 tectonic 54 basalt 53 glaciers 52 methane 52 glacier 52 seismic activity 52 sediments 51 seismic waves 50 supernova 50 seafloor 49 geysers 49 tectonic plates 49 eruption 49 sediment 48 volcanos 48 gases 48 eruptions 48 plume 48 volcanic eruptions 48 active volcanoes 48 carbonates 48 upwelling 48 quasar 48 molten 48 permafrost 47 sedimentary 47 carbonate 47 vapor 47 rock formations 47 volcanic rocks 47 supernovae 46 Kilauea 46 supermassive black holes 46 comet 46 cosmic rays 46 methane gas 46 Greenland ice 46 geologic 46 galaxies 46 seawater 46 Antarctic ice 46 convection 45 comets 45 ocean currents 45 sulphides 45 Saturn rings 45 deformation 45 glacial 44 Volcanic 44 quasars 44 sedimentary rocks 44 breccias 44 crater 44 subsurface 44 neutrinos 44 neutron stars 44 volcanic eruption 44 snowmelt 44 gamma rays 44 aquifers 43 jet stream 43 geyser 43 breccia 43 gasses 43 particles 43 capillaries 43 magnetic fields 43 nebula 43 aquifer 43 chemical reactions 43 distant galaxies 43 melting 42 gaseous 42 ash plume 42 superheated 42 heat exchanger 42 polar ice 42 chemical composition 42 ionosphere 42 Merapi 42 geologically 42 epithermal 42 carbon dioxide