Related by context. Frequent words. (Click for all words.) 64 hydrothermal vent 59 underwater volcanoes 58 marine invertebrates 58 marine sediments 58 abiotic 57 lava tubes 57 planktonic 57 biogenic 57 tubeworms 56 biogeochemical 56 hydrothermal vents 56 oceanic crust 56 magmas 55 biota 55 foraminifera 55 methanogens 55 mud volcanoes 55 diatoms 55 microscopic algae 55 stromatolites 55 oceanic 54 Cyanobacteria 54 volcanic vents 54 plankton blooms 54 intertidal zone 54 terrestrial ecosystems 54 Archaea 54 gastropods 54 alga 54 relict 54 diatom 53 archaea 53 phytoplankton blooms 53 ammonites 53 upwellings 53 landforms 53 isotope ratios 53 deplete oxygen 53 continental crust 53 geomorphology 53 prokaryotes 53 sea anemones 53 single celled organisms 53 lavas 52 ocean ridges 52 temperate forests 52 hydrothermal activity 52 ecologies 52 aragonite 52 single celled 52 benthic 52 vertebrate animals 52 microfossils 52 deltaic 52 organisms 52 inter tidal 52 aquatic invertebrates 51 igneous rocks 51 marine organisms 51 calcareous 51 volcanic islands 51 lifeforms 51 flora fauna 51 intertidal 51 hydrothermal 51 seamounts 51 microbes 51 faunal 51 igneous rock 51 basalts 50 unicellular 50 nitrogen fixation 50 biogeography 50 dinoflagellates 50 zooplankton 50 zooxanthellae 50 salt crystals 50 freshwater ponds 50 bioaccumulation 50 abundances 50 ecosystems 50 microscopic organisms 50 embayment 50 methane hydrate 50 biosphere 50 sediments 50 morphologically 50 volcanism 50 middens 50 nonliving 49 isotopic composition 49 toothed whales 49 coral 49 biogeochemistry 49 microbial 49 cyanobacteria 49 Dry Valleys 49 subtropical regions 49 indigenous cultures 49 corals 49 seamount