Related by context. Frequent words. (Click for all words.) 61 diatoms 59 hydrothermal vent 58 stromatolites 58 lava tubes 58 mud volcanoes 57 marine invertebrates 57 trilobites 56 marine sediments 56 Cyanobacteria 55 foraminifera 55 sea anemones 55 microscopic organisms 55 alga 54 hydrothermal vents 54 lake sediments 54 termite mounds 54 igneous rocks 54 prokaryotes 54 morphologically 53 oceanic crust 53 stoneflies 53 diatom 53 morphologies 53 archaea 53 microenvironments 53 sea squirts 53 sediments 52 magmas 52 single celled organisms 52 planktonic 52 microfossils 52 anemones 52 angiosperms 52 corals 52 amoebae 52 lichens 51 otoliths 51 volcanic vents 51 copepods 51 landforms 51 coral 51 lavas 51 greenish brown 51 calcareous 51 multicellular 51 planetary nebulae 51 abiotic 51 spherules 51 bacterial colonies 51 mosses 50 basaltic 50 duckweed 50 oxygen isotopes 50 organisms 50 moss 50 calcite 50 anemone 50 sea urchins 50 morphology 50 sphagnum moss 50 single celled 50 polar vortex 50 invertebrates 50 continental crust 50 ocean ridges 50 nematode worms 50 biogeochemical 50 Archaea 50 zooplankton 49 brine shrimp 49 cattail 49 sediment cores 49 salt crystals 49 mycelium 49 basalts 49 multicellular organisms 49 symbionts 49 skunk cabbage 49 toothed whales 49 periwinkles 49 sea squirt 49 microscopic algae 49 icy crust 49 tidal pools 49 nitrogen fixation 49 stalactite 49 Burgess Shale 49 isotopic composition 49 terrestrial ecosystems 49 nanosized 49 benthic 49 seaweeds 49 bathymetry 49 igneous rock 48 gobies 48 eukaryotic cells 48 pectoral fins 48 dinoflagellates 48 middens 48 Lake Vostok 48 clasts