Related by context. Frequent words. (Click for all words.) 60 saline aquifers 59 glacial till 58 sedimentary rock 57 gabbroic 56 clastic 55 magma chamber 55 gossanous 55 peridotite 55 kerogen 55 mudstones 55 undrained 55 pitchblende 55 sandstone formations 55 geologic formations 54 mudstone 54 molten rocks 54 unmineralized 54 kaolinite 53 geological formations 53 subsurface 53 hydrothermal fluids 53 basaltic 53 depositional 53 greywacke 53 Arctic permafrost 53 tonalite 53 carbonate minerals 53 andesitic 53 weakly mineralized 53 granitic rocks 53 stratigraphically 53 basalt rock 52 calcareous 52 stockwork veining 52 siltstones 52 uraniferous 52 marine sediments 52 lunar soil 52 gabbro 52 silts 52 metasedimentary 52 quartz monzonite 52 limestones 52 Lake Vostok 52 clathrates 52 igneous rock 52 methane hydrate 52 monzonite 52 pyritic 52 sandstone reservoir 52 sediment 52 diatreme breccia 52 Upper Jurassic 51 erosional 51 quartz veined 51 granitoid 51 sediments 51 felsic volcanic 51 geologic formation 51 sulphide bearing 51 shallow aquifer 51 subcrop 51 breccia pipes 51 clasts 51 Mineralization occurs 51 vuggy silica 51 sulphide deposits 51 polar craters 51 mafic volcanic 51 metamorphic rocks 51 overlying 51 Greenland glacier 51 goethite 51 #,#-#,# ft. Loc 51 tuffs 51 siltstone 51 stalactite 51 hydrothermally altered 51 alaskite 50 lava tubes 50 graben 50 volcanic vent 50 methane hydrates 50 calcite 50 syncline 50 interbedded 50 impermeable 50 cavern 50 basalts 50 sulfide minerals 50 streambeds 50 rock formations 50 calcrete 50 gas hydrates 50 schists 50 revegetated 50 alluvial deposits 50 methane CH4 50 siliceous 50 intermittent streams 50 alluvium