Related by context. Frequent words. (Click for all words.) 46 hydrothermal vents 44 oceans 43 marine biodiversity 42 biosphere 41 coral reefs 41 corals 41 oyster reefs 40 sea creatures 40 marine organisms 40 marine ecosystems 40 diatoms 39 organisms 39 Coral reefs 39 ocean 39 reefs 39 biodiversity 38 coral 38 coral species 38 planets 38 ecosystems 38 Northwestern Hawaiian Islands 38 glaciers 38 habitats 37 oceanography 37 boreal 37 mass extinctions 37 mammals 37 mangrove forests 37 microbes 37 oceanographers 37 extinctions 37 coral reef 36 ocean ecosystems 36 creatures 36 sperm whales 36 reef 36 oceanic 36 Antarctic 36 seafloor 35 zooplankton 35 planet 35 permafrost 35 estuaries 35 aquatic species 35 plankton 35 eelgrass 34 Coral Triangle 34 Antarctica 34 jellyfish 34 Earth crust 34 Earth 34 Arctic Ocean 34 marine ecosystem 34 landmass 33 continental shelf 33 tropical forests 33 seagrass 33 sediments 33 coastal ecosystems 33 estuarine 33 salt marshes 33 planetary 33 earth 32 marine mammals 32 seabed 32 whales 32 Earths 32 mangroves 32 plate tectonics 32 shorelines 32 humankind 32 coastal waters 32 Martian surface 32 freshwater lakes 32 Antarctic ice 31 aquatic ecosystems 31 asteroids 31 polar regions 31 cetaceans 31 tropical forest 31 Antarctic Peninsula 31 phytoplankton 31 coastlines 31 coastal wetlands 31 Saturn moon 31 boreal forest 31 ocean acidification 31 Bering Sea 31 atmospheric carbon dioxide 31 mass extinction 31 volcanoes 30 Arctic 30 marine habitats 30 Greenland ice 30 sea 30 marine 30 tropical rainforests 30 coastal marshes 30 equator 30 tropics 30 oceanographic