Related by context. Frequent words. (Click for all words.) 47 Xcalak 46 shallow reefs 45 corals 45 coral 45 undersea volcanoes 45 reefs 44 foraminifera 43 rocky reefs 43 toothed whales 43 seagrass beds 43 microscopic plankton 43 aquatic invertebrates 43 migrating whales 43 benthic 42 zooxanthellae 42 marine invertebrates 42 coral reefs 42 inter tidal 42 plankton blooms 41 phytoplankton blooms 41 hawksbill 41 freshwater marshes 41 seaweeds 41 baleen whales 41 reef 40 copepods 40 tiny crustaceans 40 microscopic algae 40 Volcano erupts 40 underwater volcanoes 40 Ferry sinks 40 coral species 40 macroalgae 39 reef sharks 39 coral bleaching 39 apex predators 39 coral reef 39 intertidal 39 whales dolphins 39 coastal 39 intertidal zone 39 marine sediments 39 upwellings 38 Coral reefs 38 Humpback whales 38 seagrasses 38 damselfish 38 Sperm whales 38 nearshore waters 38 sea anemones 38 kelp beds 38 mangroves 38 subtropical regions 38 seagrass 38 ocean acidification 38 Sea otters 38 butterfish 38 gastropods 38 aragonite 38 underwater grasses 38 seamounts 38 ocean 38 oyster reef 37 terrestrial ecosystems 37 diatoms 37 filter feeders 37 Coral Reefs 37 baleen whale 37 monk seals 37 jellyfish 37 oceanic 37 Adelie penguins 37 ocean acidity 37 Phytoplankton 37 marbled murrelets 37 Somali pirates seize 37 longline 37 Irrawaddy dolphins 37 mangrove trees 37 Minke whales 37 seabeds 37 Honshu island 37 sharks rays 37 seamount 37 reef shark 37 shorelines 36 marine sanctuaries 36 ammonites 36 tidal pools 36 gobies 36 coral reef ecosystems 36 oyster shell 36 snail shells 36 Whale sharks 36 turtle nests 36 stalagmites 36 planktonic 36 hammerhead sharks 36 sperm whales 36 hydrothermal vent 36 sea otters