Related by context. Frequent words. (Click for all words.) 68 hydrothermal activity 61 magmas 60 crustal 60 marine sediments 60 volcanism 59 igneous rocks 58 meteorite impacts 58 lithosphere 58 magmatic 57 deglaciation 57 hydrothermal 56 magnetic reconnection 56 lavas 56 Valles Marineris 56 biogeochemical 55 clasts 55 metamorphism 55 andesitic 55 basaltic 55 hydrothermally altered 55 magma chamber 55 pyroclastic 55 undersea volcanoes 54 volcanic vents 54 olivine 54 mineralizing 54 conductive zones 54 carbonate rocks 54 subduction 54 lithologic 54 extensional 54 Archaean 54 continental crust 54 methane hydrate 54 substorm 54 dacite 54 plate tectonics 54 kimberlitic 54 clathrates 54 graben 54 basalts 53 gravity anomalies 53 granitic rocks 53 oceanic crust 53 biogenic 53 uranium thorium 53 solar nebula 53 atmospheric methane 53 geologic 53 depositional 53 underwater volcanoes 53 geochemically anomalous 53 Geological mapping 53 isotope ratios 53 magma 53 surficial 53 ejecta 53 erosional 53 quartz monzonite 53 hornfels 53 upper troposphere 53 icy moons 52 Saturn moons 52 explosive eruptions 52 lava tubes 52 mud volcanoes 52 X ray emission 52 chalcopyrite mineralization 52 brecciation 52 isotopic composition 52 planetesimals 52 NE trending 52 hydrothermal breccia 52 ALH# 52 vuggy silica 52 heavily cratered 52 glaciations 51 Cenozoic 51 extinct volcanoes 51 Saturn moon Enceladus 51 fumaroles 51 metamorphic rocks 51 tuffs 51 earth crust 51 desorption 51 volcanic 51 gneisses 51 subduction zones 51 hydrological cycle 51 Tharsis 51 peridotite 51 gaseous planets 51 sulphide bearing 51 igneous rock 51 deformation 51 intrusives 51 subsurface 51 tectonic 51 magnetic anomalies 51 hydrologic cycle 51 tropospheric