Related by context. Frequent words. (Click for all words.) 67 hydrothermal vent 66 hydrothermal vents 66 lava tubes 60 volcanoes 60 volcanic islands 56 marine invertebrates 56 marine sediments 56 volcanic gases 56 ocean ridges 56 hydrothermal activity 55 seamount 54 volcanism 54 seamounts 54 microscopic organisms 54 volcanic 53 sea anemones 53 methane hydrates 53 subduction zones 53 lava flows 53 volcanically active 53 stromatolites 53 limestone caves 52 explosive eruptions 52 oceanic crust 52 Kilauea Volcano 52 microscopic algae 52 Saturn moons 52 foraminifera 52 Kilauea volcano 52 lavas 51 sea squirts 51 magma chamber 51 underwater caves 51 volcanic crater 51 mass strandings 51 Saturn moon Enceladus 51 steam vents 51 microfossils 51 lava tube 51 active volcanoes 51 planktonic 50 magnetic reconnection 50 astronomical objects 50 solar corona 50 lithosphere 50 supernova remnants 50 tidal pools 50 intertidal 50 landforms 50 aerosol particles 50 Weddell Sea 50 stalagmites 50 single celled organisms 50 basalts 49 nebulae 49 methane hydrate 49 coral reefs 49 volcanic activity 49 rocky planets 49 sediments 49 dinoflagellates 49 planetary nebulae 49 trilobites 48 corals 48 caldera 48 oceanographers 48 Earth crust 48 seabeds 48 copepods 48 sperm whales 48 baleen whales 48 silicates 48 sea creatures 48 middens 48 Cyanobacteria 48 Oceanographers 48 hydrothermal 48 hot springs 48 coral 48 marine organisms 48 sea slugs 48 archaea 48 molten rock 48 magmatic 48 Kuiper belt 48 vortices 48 coral atolls 48 geologically active 47 continental crust 47 auroral 47 volcanic rock 47 subtropical regions 47 X ray emission 47 ocean 47 Saturn moon 47 lava 47 colliding galaxies 47 polycyclic aromatic hydrocarbons PAHs 47 gobies 47 atmospheric methane 47 isotopic composition