Related by context. Frequent words. (Click for all words.) 75 methane hydrates 71 gas hydrates 60 kerogen 60 geological formations 56 sedimentary basins 55 magmatic 55 biogenic 55 hydrocarbons 55 sedimentary rock 54 peridotite 54 continental crust 54 shales 54 zeolites 53 oceanic crust 53 magma chamber 53 lavas 53 hydrocarbon 53 hydrothermal 53 liquid hydrocarbons 53 volcanism 53 methane 52 technically recoverable 52 geologic formations 52 quark gluon plasma 52 marine sediments 52 hydrothermal vents 52 olivine 52 lunar soil 51 subsurface 51 shale 51 geologic 51 melting permafrost 51 subduction zones 50 permafrost 50 geologically active 50 diatoms 50 crustal 50 carbonates 50 shale deposits 50 regolith 50 economically recoverable 49 Bose Einstein condensate 49 Barents Sea 49 volcanic gases 49 magma 49 salt domes 49 basalts 49 hydrates 49 Geochemistry 49 geologically 49 geological 49 lava 49 Tcf 49 carbonate 49 sedimentary basin 49 moon Europa 48 ionic liquid 48 lunar poles 48 sediments 48 coalbed methane 48 hydrological cycle 48 adsorbent 48 basalt 48 aerosol particles 48 lithosphere 48 desorption 48 hydrocarbon reserves 48 Arctic Ocean 48 condensates 48 volcanically active 48 Bakken Formation 47 silicates 47 Bakken formation 47 microfossils 47 ionized gas 47 abiotic 47 carbonaceous 47 volcanic 47 astrobiologists 47 apatite 47 Lower Cretaceous 47 subduction zone 47 geothermal 47 Tindalo 47 deuterium 47 seabed 47 thorium 47 earth crust 47 glacial till 47 gas condensate 47 terrestrial ecosystems 47 shale formations 47 ionic liquids 46 atmospheric CO 46 carbon sequestration 46 rocky planets 46 interglacial period 46 continental shelf 46 carbonic acid 46 lava flows 46 carbon dioxide