Related by context. Frequent words. (Click for all words.) 73 geologically active 61 active volcanoes 60 active volcanos 57 volcanism 55 seismically active regions 55 volcanoes 55 Saturn moon Enceladus 55 volcanic activity 54 Kuiper belt 54 volcanic 54 caldera 54 Saturn moons 53 X ray emission 53 biologically diverse 52 moon Titan 52 Enceladus 52 magmatic 51 lava flows 51 tectonic plates collide 51 Large Magellanic Cloud 51 lithosphere 51 seamount 51 Eta Carinae 51 igneous 51 equatorial regions 51 subtropical regions 51 basalts 51 brown dwarf 51 extrasolar planet 51 subduction zones 51 Kuiper Belt 50 substorms 50 hydrothermal 50 mid latitudes 50 Sedna 50 Saturn moon 50 super Earths 50 seismically active 50 sedimentary rock 50 rocky planets 50 magnetar 50 extrasolar planets 50 Geologically 49 HD #b [002] 49 nebula 49 volcanic islands 49 crustal 49 equatorial 49 geologically 49 unaided eye 49 gamma ray burst 49 Earth crust 49 hydrothermal vents 49 volcanic eruptions 49 polar regions 49 Iapetus 49 optical telescope 49 volcanic crater 48 magnetosphere 48 supernova remnant 48 Orion Nebula 48 dormant volcano 48 galaxy cluster 48 plate tectonics 48 biodiverse 48 supernova explosion 48 earth crust 48 terrestrial planets 48 extinct volcano 48 spewed ash 48 Very Large Telescope 48 optical telescopes 48 seamounts 48 ESO Very Large Telescope 48 habitable planets 47 seismic activity 47 troposphere 47 landforms 47 Sunspots 47 planet orbiting 47 XMM Newton 47 basalt 47 Saturn rings 47 ejecta 47 exoplanet 47 brown dwarfs 47 Kilauea volcano 47 distant galaxy 47 moon Europa 47 planets orbiting 47 volcanos 47 astronomical objects 47 University Lamont Doherty 47 astronomers 47 auroral 47 geologic 47 X ray Observatory 47 Jupiter moons 46 WM Keck Observatory 46 Spitzer Space Telescope 46 Betelgeuse