Related by context. Frequent words. (Click for all words.) 63 phytoplankton 62 terrestrial ecosystems 61 algal blooms 60 nitrogen fixation 60 plankton 60 upwelling 59 diatoms 59 harmful algal blooms 59 marine organisms 58 toxic algae blooms 58 microscopic algae 57 ocean acidity 56 aerosol particles 56 hydrological cycle 56 atmospheric methane 56 ocean currents 55 algae blooms 55 marine sediments 55 species extinctions 55 anoxic 55 photosynthetic 54 sediments 54 carbonic acid 54 Phytoplankton 54 microscopic organisms 53 dinoflagellates 53 explosive eruptions 53 algae 53 atmospheric carbon dioxide 53 copepods 53 ocean 53 oceans 53 zooplankton 53 algal bloom 53 glacial melt 53 gyre 53 diatom 53 methane hydrate 53 atmospheric circulation 53 atmospheric CO 53 acidification 53 photosynthesis 52 eel grass 52 volcanism 52 atmospheric CO2 52 marine ecosystems 52 alga 52 gobies 51 storminess 51 sea squirts 51 El Ninos 51 marine invertebrates 51 coral bleaching 51 sediment 51 stomata 51 Ocean acidification 51 intertidal 51 tidal pools 51 glaciers melt 51 kelp 51 biota 51 greenhouse warming 50 reefs 50 phosphorescence 50 aquatic ecosystems 50 oxygen depletion 50 algal 50 freshwater ecosystems 50 protozoan 50 sediment cores 50 entrained 49 methane hydrates 49 hydrothermal vents 49 oceanic 49 El Nino warming 49 salinity 49 kelp forests 49 biogenic 49 polar caps 49 corals 49 krill 49 glacial melting 49 freshwater mussels 49 oceanographers 49 kelp beds 49 dissolved oxygen 49 Daphnia 49 thermocline 49 equatorial Pacific 49 aquatic habitats 49 aquatic organisms 49 hydrogen ions 49 lake sediments 48 ocean ecosystems 48 absorbing carbon dioxide 48 ocean acidification 48 benthic 48 eddies 48 toxic algae bloom 48 seaweeds 48 vortices