Related by context. Frequent words. (Click for all words.) 56 hydrothermal activity 54 lake sediments 53 marine sediments 53 biogeochemical 53 Seafloor 52 Neoproterozoic 52 subglacial 52 upper troposphere 51 sediment cores 51 deglaciation 51 Melting glaciers 50 Lava flows 50 atmospheric aerosols 50 El Niño Southern Oscillation 50 penetrating radar 50 permanently shadowed craters 50 Arctic permafrost 50 pyroxene 50 elemental composition 50 isotopic composition 50 volcanic vents 50 ocean basins 49 Snowball Earth 49 abyssal 49 oxygen isotope 49 igneous rocks 49 aragonite 49 methane CH4 49 pervasively altered 49 El Nino Southern Oscillation 49 isotope ratios 48 jarosite 48 sulfide minerals 48 oxygen isotopes 48 Cenozoic 48 polar craters 48 loess 48 Equatorial Pacific 48 methane ethane 48 abiotic 48 biogeography 48 refugia 48 NASA MODIS Image 48 Spectroscopic 48 erosional 48 volcanically active 48 Qinghai Tibet Plateau 48 multi decadal 47 underwater volcanoes 47 biogenic 47 paleoclimate 47 subalpine 47 SN #/#/# [002] 47 molten rocks 47 sedimentary layers 47 acidify 47 worsening droughts 47 Diviner 47 Qinghai Tibet plateau 47 AP Interview CG 47 admiral asks 47 Biogeography 47 #:#-# [029] 47 Quaternary 47 volcanic lava 46 Geochemistry 46 hydrologic cycle 46 Oxidized 46 tropopause 46 Excavated 46 Eric Rignot 46 upwellings 46 goethite 46 Svalbard archipelago 46 lunar craters 46 geomorphology 46 Biogeochemistry 46 Eemian 46 earthquakes volcanoes 46 magnetic susceptibility 46 antarctic 46 Rignot 46 Hydrothermal 46 glacial melt 46 clathrates 46 Subtropical 46 Melting ice 45 Fossilized 45 Ediacaran 45 Siberian permafrost 45 polar caps 45 Coral bleaching 45 Permeability 45 manganese oxide 45 permafrost thaws 45 metamorphism 45 petrographic 45 Dry Valleys 45 bathymetry 45 photosphere 45 lithic