Related by context. Frequent words. (Click for all words.) 59 hydrothermal vent 54 landforms 54 volcanism 54 hydrothermal activity 53 basalts 53 magmatic 52 lavas 52 continental crust 52 tectonics 52 lithosphere 52 basaltic 52 crustal 52 oceanic crust 52 lava tubes 52 stromatolites 52 calcareous 51 ocean ridges 51 morphologies 51 sedimentary rock 51 Lichens 51 marine sediments 51 lichens 51 biota 50 foraminifera 50 marine invertebrates 50 hydrothermal vents 50 biogenic 50 seamount 50 terrestrial ecosystems 50 volcanic 50 sediments 50 Tibetan Plateau 49 nitrogen fixation 49 diatoms 49 igneous 49 planktonic 49 geologic 49 subduction 49 mineralogy 49 subduction zones 49 olivine 49 silicates 49 nucleation 49 landform 49 geomorphology 48 methane hydrate 48 volcanic rock 48 isotopic composition 48 Geologically 48 volcanic gases 48 volcanically active 48 depositional 48 bathymetry 48 peridotite 48 explosive eruptions 48 Cyanobacteria 48 abiotic 48 lake sediments 48 basalt 48 sedimentary 48 microbiome 48 extensional 48 subduction zone 48 aerosol particles 48 spherules 48 poleward 47 carbonaceous 47 morphology 47 rock outcrop 47 Meridiani 47 Saturn moon Enceladus 47 intertidal 47 mineralizing 47 outcroppings 47 facies 47 Polar Regions 47 Didymo 47 micro climates 47 glacial melting 47 biogeochemistry 47 intrusives 47 topography 47 volcanic activity 46 granitic 46 multicellular organisms 46 rock outcrops 46 temperature gradient 46 ultramafic rocks 46 graben 46 surficial 46 mudstone 46 steam vents 46 tectonic 46 calcite 46 caldera 46 iron oxides 46 middens 46 zircons 46 seamounts 46 glacial till 46 hydrothermal