Related by context. Frequent words. (Click for all words.) 66 lavas 65 marine sediments 65 sediments 62 basalts 61 magma chamber 61 glacial melt 60 sedimentary rock 60 Sediments 59 hydrothermal activity 59 sediment 59 basalt 59 glacial retreat 59 glacial till 59 microfossils 59 stromatolites 59 continental crust 59 sediment cores 58 mudstone 58 atmospheric methane 58 basaltic 58 glaciation 58 meltwater 58 Quaternary 58 lithosphere 58 lake sediments 57 oceanic crust 57 volcanism 57 poleward 57 olivine 57 landforms 57 isotopic composition 57 Meridiani 57 alluvium 57 polar caps 57 spherules 56 mid latitudes 56 aerosol particles 56 calcite 56 hydrological cycle 56 stalagmite 56 foraminifera 56 calcareous 56 sulphide minerals 56 interglacial period 56 lava tubes 56 crustal 56 ejecta 55 silty 55 iron oxides 55 peridotite 55 sedimentary rocks 55 diatoms 55 bathymetry 55 Geochemistry 55 thawing permafrost 55 Arctic permafrost 55 Earth crust 55 sedimentary 54 solar nebula 54 glacial ice 54 Tibetan Plateau 54 geomorphology 54 hydrothermal vent 54 Carboniferous 54 oxygen isotopes 54 zircons 54 sediment samples 54 terrestrial ecosystems 54 Late Cretaceous 54 graben 54 stalagmites 54 melting glacier 54 osmium 54 earth crust 53 Ordovician 53 retreating glaciers 53 supercontinent 53 magmatic 53 landmasses 53 permafrost 53 diatom 53 Weddell Sea 53 lakebed 53 lunar soil 53 geologic 53 depositional 52 silt 52 Greenland Ice 52 limestone caves 52 explosive eruptions 52 sulphates 52 limestones 52 peat bogs 52 interbedded 52 rock outcrops 52 pyroxenite 52 siltstone 52 volcanic gases 52 salt crystals 52 ocean ridges 52 methane hydrate