Related by context. Frequent words. (Click for all words.) 64 volcanoes 60 volcanism 59 volcanic eruptions 59 mass extinctions 59 Volcanic eruptions 58 subduction zones 58 substorms 58 volcanically active 57 continental drift 57 lava flows 56 meteoroids 56 plate tectonics 55 lavas 55 mass extinction 55 Eruptions 55 active volcanoes 54 single celled organisms 54 GRBs 54 volcanic gases 54 glaciers 54 eruptions 54 glaciation 54 marine sediments 53 terrestrial ecosystems 53 polar caps 53 volcanic activity 53 icecaps 53 hydrothermal vents 53 volcanic islands 53 lithosphere 53 volcanos 53 Greenland glaciers 53 megafauna 52 subatomic particle 52 tectonics 52 sunspot cycle 52 super Earths 52 Iapetus 52 seamounts 52 Saturn rings 52 X ray emission 52 seamount 52 flu pandemics 52 caldera 52 greenhouse warming 52 seismically active regions 52 trilobites 52 extrasolar planets 52 Saturn moons 52 El Ninos 52 landmasses 52 supernova explosion 52 continental crust 52 retreating glaciers 52 geologically active 51 volcanic 51 volcanic eruption 51 oceanic crust 51 methane hydrates 51 glaciers melt 51 active volcanos 51 extinctions 51 magnetar 51 galaxy formation 51 landforms 51 biodiversity hotspots 51 glaciologists 51 University Lamont Doherty 51 Little Ice Age 50 geomagnetic storms 50 basalts 50 Eta Carinae 50 Weddell Sea 50 Jupiter moons 50 subduction zone 50 Kuiper belt 50 habitable planets 50 rocky planets 50 moon Charon 50 mountain glaciers 50 meteoroid 50 Earth crust 50 species extinctions 50 interglacial 50 solar flares 50 astronomical objects 50 planet orbiting 50 aerosol particles 50 vertebrate species 50 Greenland Ice 49 astrobiologists 49 subtropical regions 49 sediment cores 49 Denisovans 49 particle physicists 49 sunspot 49 volcanic crater 49 biomes 49 cosmic rays 49 volcano 49 sunspots