Related by context. Frequent words. (Click for all words.) 64 marine sediments 62 lake sediments 62 biogeochemical 61 foraminifera 60 isotope ratios 60 Neoproterozoic 60 sediment cores 60 subglacial 59 microfossils 57 clathrates 57 volcanic vents 57 erosional 57 isotopic composition 57 aragonite 57 elemental composition 57 oxygen isotopes 56 igneous rocks 56 refugia 56 temperature gradients 56 Greenland glacier 56 hydrothermal activity 56 lunar craters 56 paleoclimate 56 biodegraded 56 jarosite 56 brachiopods 55 methane ethane 55 spatial scales 55 sediment samples 55 sulfide minerals 55 deglaciation 55 uranium thorium 55 calcareous 55 permanently shadowed craters 55 sediments 55 hydrothermal vent 55 Upper Jurassic 55 oxygen isotope 54 magnetic susceptibility 54 amphipods 54 loess 54 underwater volcanoes 54 Weddell Sea 54 upwellings 54 methane CH4 54 saline aquifers 54 upper troposphere 54 abundances 54 surficial 54 bathymetry 54 inter tidal 54 plankton blooms 54 lunar soil 54 Arctic permafrost 54 terrestrial ecosystems 53 concretions 53 continental crust 53 icy moons 53 goethite 53 numerical modeling 53 otolith 53 hydrothermal fluids 53 monazite 53 bathymetric 53 geomorphology 53 lavas 53 geochemical samples 53 subsurface 53 Martian rocks 53 Svalbard archipelago 53 Martian meteorites 53 methane hydrate 53 Quaternary 53 iron oxides 53 icy crust 53 sedimentary rock 52 mud volcanoes 52 carbonate minerals 52 Sediments 52 coniferous forests 52 mesoscale 52 stibnite 52 electrochemically 52 Ordovician 52 naturally occurring mineral 52 Lake Vostok 52 oceanic crust 52 polar caps 52 crustal 52 lithosphere 52 surface geochemistry 52 undersea volcanoes 52 glacial melt 52 Eemian 52 copper oxides 52 tonalite 52 polar craters 52 calcite 52 embayment 52 kimberlitic 52 aerosol particles