Related by context. Frequent words. (Click for all words.) 53 Volcanic eruptions 50 glaciers 49 volcanic eruptions 48 scarps 47 volcanism 47 megafauna 47 landforms 47 marine sediments 47 species extinctions 47 geologic 46 volcanically active 46 drainage basins 46 river deltas 46 freshwater ecosystems 46 geologically 46 landmass 45 landmasses 45 Geologically 45 Weddell Sea 45 seamounts 45 crustal 45 terrestrial ecosystems 45 earth crust 45 glacial lakes 45 subduction zones 45 lake sediments 45 mass extinctions 45 glaciation 45 mountain glaciers 44 lava flows 44 geologically active 44 polar caps 44 biota 44 sedimentary basins 44 river basins 43 biodiversity hotspots 43 observatories 43 volcanoes 43 Wilkins Ice Shelf 43 volcanic activity 43 earths 43 glacial ice 43 lakes 43 El Ninos 43 seismically active regions 43 geological formations 42 rivers 42 snowpacks 42 carbonate rocks 42 meltwater 42 freshwater lakes 42 rookeries 42 river valleys 42 earthquakes 42 hydrological cycle 42 geological 42 biosphere 42 basalt 42 plate tectonics 42 Late Cretaceous 42 Precambrian 42 Glaciers 42 stalagmite 42 mountain ranges 42 Ross Ice Shelf 41 manmade 41 prolonged droughts 41 VMS deposits 41 aquifers 41 magmatic 41 meteoroids 41 rock outcrops 41 Antarctic ice 41 Greenland glaciers 41 meteorites 41 ecologies 41 sediment cores 41 continental drift 41 glacier 41 glacial melt 41 icecap 41 dinosaurs roamed 41 basalts 41 occurrences 40 sedimentary rock 40 landform 40 permafrost 40 fertile soils 40 icebergs 40 forest ecosystems 40 extinctions 40 methane hydrate 40 lithosphere 40 calcite 40 orebodies 40 sediments 40 substorms 40 ecosystems 40 Saturn moons 40 aquatic ecosystem 40 supernova explosion