Related by context. Frequent words. (Click for all words.) 69 sediments 69 lake sediments 65 sediment cores 62 terrestrial ecosystems 62 sediment 61 sedimentary rock 61 sedimentary 61 isotopic 60 oxygen isotopes 60 volcanism 60 magmatic 60 geomorphology 60 Quaternary 59 basalts 59 crustal 58 sedimentary rocks 58 diatoms 58 olivine 57 lithosphere 57 biota 57 Geochemistry 57 hydrothermal 56 glaciation 56 Late Cretaceous 56 soils 56 nitrogen fixation 56 subduction zones 56 Ordovician 56 peridotite 55 diatom 55 iron oxides 55 tectonics 55 ejecta 55 geochemistry 55 Precambrian 55 permafrost 55 biogenic 55 intertidal 55 aerosol particles 55 glacial till 55 Pliocene 54 geologic 54 landforms 54 volcanic 54 hydrothermal vents 54 microscopic organisms 54 methane hydrates 54 radiocarbon 54 mudstone 53 stalagmite 53 sulfides 53 calcite 53 volcanic rocks 53 earth crust 53 calcareous 53 hydrological cycle 53 Greenland Ice 53 seamount 53 atmospheric CO2 53 retreating glaciers 53 sediment samples 53 seamounts 53 lava flows 53 interglacial 53 plate tectonics 53 paleo 53 Carboniferous 53 mid latitudes 52 volcanic gases 52 archaea 52 apatite 52 middens 52 Earth crust 52 atmospheric carbon dioxide 52 abiotic 52 upwelling 52 limestones 52 alluvium 52 geochemical 52 silicates 52 trilobites 52 stratospheric ozone 52 sulphides 52 glaciers 52 carbonaceous 52 basalt 52 anoxic 52 ultramafic rocks 52 methane hydrate 52 zeolites 51 polycyclic aromatic hydrocarbons PAHs 51 stable isotope 51 Eocene 51 subsurface 51 sulfide mineralization 51 abundances 51 mass extinctions 51 megafauna 51 facies 51 volcanoes 51 tuffs