Related by context. Frequent words. (Click for all words.) 61 underwater volcanoes 61 undersea volcanoes 60 volcanic vents 60 upwellings 60 hydrothermal vent 59 mud volcanoes 59 hydrothermal vents 57 fumaroles 56 marine sediments 55 deplete oxygen 55 clathrates 55 Cyanobacteria 55 lava tubes 55 methane hydrate 55 coral formations 54 killifish 54 Seafloor 54 cone snails 54 Lava flows 54 decaying vegetation 54 equatorial waters 54 Lake Vostok 53 extremophiles 53 permafrost thaws 53 Arctic permafrost 53 molten rocks 53 sargassum 53 foraminifera 53 volcanically active 53 extinct volcanoes 53 hydrothermal activity 53 temperate forests 53 saline aquifers 53 plankton blooms 52 Saturn moon Enceladus 52 refugia 52 amphipods 52 basalt rock 52 Svalbard archipelago 52 Sea otters 52 marine invertebrates 52 Carina Nebula 51 phytoplankton blooms 51 tubeworms 51 steam vents 51 biogeochemical 51 Yellowstone caldera 51 photosynthetic bacteria 51 permanently shadowed craters 51 sea anemones 51 gastropods 51 oceanic crust 51 ocean ridges 51 Kilauea Volcano 51 erupting volcanoes 50 Greenland glacier 50 lunar craters 50 subtropical regions 50 termite mounds 50 seagrass meadows 50 alga 50 subglacial 50 damselfish 50 meteor impacts 50 Wadden Sea 50 polar vortex 50 freshwater ponds 50 geologically active 50 tunicates 50 inter tidal 50 shallow reefs 50 gyres 50 sea anemone 50 microscopic organisms 49 planktonic 49 corals 49 volcanic crater 49 sediment cores 49 magmas 49 volcanic islands 49 endemism 49 sandstone formations 49 peat swamps 49 biodiversity hotspot 49 volcanic gases 49 Lop Nur 49 naturally occurring mineral 49 californica 49 Scientists theorize 49 primitive organisms 49 terrestrial ecosystems 49 rocky reefs 49 intertidal zone 49 tidal pools 49 photosynthetic organisms 49 seabeds 49 water striders 49 Weddell Sea 49 flatworms 49 elkhorn 49 gaseous planets