Related by context. Frequent words. (Click for all words.) 55 glaciations 55 Oligocene 55 Carboniferous 54 interglacial 54 deglaciation 53 Pliocene 53 Eocene 52 hydrothermal activity 52 Younger Dryas 52 photosphere 52 Ordovician 51 isotopic composition 51 mid latitudes 51 solar nebula 51 Quaternary 51 Cenozoic 51 Paleocene 50 interglacial period 50 marine sediments 50 biogeochemical 50 El Niño Southern Oscillation 50 Late Cretaceous 50 depositional 49 hydrothermal vent 49 polar caps 49 Early Cretaceous 49 lavas 49 sediment cores 49 lake sediments 49 igneous rocks 49 abundances 48 polar vortex 48 metamorphism 48 Snowball Earth 48 perihelion 48 surficial 48 intersected #.#m [001] 48 basalts 48 interbedded 48 undersea volcanoes 48 anomalous uranium 48 Medieval Warm Period 47 mineralized intercept 47 Triassic 47 isotopic 47 Holocene 47 andesitic 47 Dry Valleys 47 basaltic 47 graben 47 spatial scales 47 Cretaceous Period 47 Late Triassic 47 surface trenching 47 porosities 47 upwellings 47 volcanism 47 Archaean 46 Cretaceous 46 Lower Cretaceous 46 glaciation 46 Valles Marineris 46 Antarctic ozone 46 igneous rock 46 uranium thorium 46 Precambrian 46 lava tubes 46 hydrothermally altered 46 pyroxenite 46 Paleozoic 46 calcite 46 Carina Nebula 46 chalcopyrite mineralization 46 ejecta 46 crustal 46 magmas 46 moraines 46 mud volcanoes 46 sulphide bearing 46 hydrothermal breccia 46 oxygen isotopes 46 Mesozoic 46 tuffs 46 substorm 46 gravity anomalies 46 Mineralization consists 46 icy moons 45 gossans 45 Polar Regions 45 solar corona 45 siliceous 45 MGS Mars Orbiter Camera 45 faunal 45 extensional 45 continental crust 45 planetary nebulae 45 exosphere 45 felsic volcanic 45 microfossils 45 Upper Cretaceous 45 Tharsis