Related by context. Frequent words. (Click for all words.) 59 Chicxulub 58 stromatolites 56 ejecta 56 methane hydrate 56 hydrothermal activity 56 hydrothermal vent 55 magma chamber 55 spherules 54 volcanism 54 magmatic 54 continental crust 54 marine sediments 54 depositional 53 oceanic crust 53 graben 53 Geologically 53 subsurface 53 olivine 52 Cabeus 52 sedimentary rock 52 geologic 52 solar nebula 52 methane hydrates 52 geologically active 51 igneous 51 basalts 51 lava tubes 51 Meridiani 51 crustal 51 hydrothermal vents 51 hydrothermal 51 basaltic 51 Geochemistry 50 foraminifera 50 mineralizing system 50 isotopic composition 50 geologically 50 geological formations 49 meteoroid 49 lavas 49 microfossils 49 extensional 49 basalt 49 gas hydrates 49 supernova explosion 49 silicates 49 gravity anomaly 49 planetary nebulae 49 Kuiper belt 48 Lower Cretaceous 48 biogenic 48 areal extent 48 carbonate rocks 48 abiotic 48 Paleocene 48 Ordovician 48 supernova remnant 48 breccia pipe 48 zircons 48 lithosphere 48 magnetic anomalies 48 osmium 48 Astrophysicists 48 volcanically active 48 Cabeus crater 48 MARSIS 48 X ray emission 48 subduction 48 Carboniferous 48 breccia zone 48 crater 48 Endurance Crater 48 geological 48 haematite 47 Earth crust 47 astrobiologists 47 subduction zones 47 geology 47 icecap 47 magnetic reconnection 47 peridotite 47 sedimentary basin 47 kimberlitic 47 seismicity 47 temperature gradient 47 geologists 47 carbonaceous 47 tectonics 47 Younger Dryas 47 magnetar 47 Precambrian 47 Burgess Shale 46 cometary 46 surficial 46 hydrothermal alteration 46 downdip 46 journal Geology 46 anomalously 46 sedimentary basins 46 Eocene 46 terrestrial planets