Related by context. Frequent words. (Click for all words.) 54 mass extinction 50 volcanism 49 sunspot cycle 49 mass extinctions 49 greenhouse warming 48 glaciation 46 supernova explosion 46 ejecta 46 galaxy formation 45 methane hydrates 45 lithosphere 45 magnetar 45 volcanic eruptions 44 Ocean acidification 44 mid latitudes 44 interglacial 44 supernova explosions 43 species extinctions 43 anthropogenic 43 meteoroid 43 sunspot activity 43 megafauna 43 plate tectonics 43 magmatic 42 Carboniferous 42 X ray emission 42 melting permafrost 42 extinctions 42 crustal 42 Precambrian 42 Eocene 42 Quaternary 42 perturbations 42 Ordovician 42 abiotic 42 Mesozoic 42 geologically active 41 equatorial regions 41 volcanically active 41 radioactive decay 41 Little Ice Age 41 volcanic 41 GRBs 41 terrestrial ecosystems 41 marine sediments 41 cosmological 41 perturbation 41 hypothesised 41 anthropogenic climate 41 Pliocene 41 Tunguska 41 auroral 41 hydrothermal 41 decadal 41 Proterozoic 41 meteoroids 40 eruptive 40 atmospheric CO2 40 hydrological cycle 40 Greenland glaciers 40 atmospheric carbon dioxide 40 ocean acidity 40 substorms 40 asteroid 40 basalts 40 gamma ray burst 40 hypothesis 39 Late Cretaceous 39 Fig. 39 continental drift 39 calcite 39 multicellular 39 Eta Carinae 39 cataclysmic 39 geomagnetic 39 speciation 39 accreting 39 coronal mass ejection 39 climate alarmists 39 trilobites 39 Cretaceous 39 biosphere 39 dynamical 39 GeV 39 glacial melt 39 CO2 concentrations 39 Earth magnetosphere 39 z = 39 ENSO 39 mineralizing 39 Holocene 39 invariant 39 paleo 39 postulated 39 geomagnetic field 39 planetary 38 atmospheric circulation 38 coral bleaching 38 oceanic 38 sunspot 38 magnetosphere