Related by context. Frequent words. (Click for all words.) 77 glaciation 68 volcanism 67 mass extinctions 66 Little Ice Age 59 mass extinction 59 Pleistocene 59 Pliocene 58 plate tectonics 58 mid latitudes 58 Ordovician 57 volcanic eruptions 57 Holocene 56 megafauna 56 epochs 56 greenhouse warming 56 glaciers 56 atmospheric circulation 56 Eocene 55 landforms 55 extinctions 54 sediments 54 mountain glaciers 54 permafrost 54 supernova explosion 54 crustal 54 Precambrian 53 geologic 53 eruptions 53 atmospheric concentrations 53 glacial 53 volcanic activity 52 mammoths 52 Cretaceous 52 atmospheric CO2 52 perturbations 52 atmospheric carbon dioxide 52 lava flows 51 greenhouse gas concentrations 50 upwelling 50 sedimentary rocks 50 abundances 50 geologically 50 Serreze 50 seismicity 50 perturbation 50 sedimentary rock 49 desiccation 49 diatoms 49 sunspot 49 tectonics 49 influenza pandemics 49 PETM 49 Triassic 49 Greenland ice 49 equatorial 49 latitudes 49 sunspots 49 subduction zones 48 Mesozoic 48 millennia 48 decadal 48 oscillations 48 Ice Age 48 volcanic eruption 48 subduction 48 calcite 48 polar regions 48 Antarctic Peninsula 48 isotopic 48 Antarctic ice 48 geomagnetic field 48 Paleozoic 48 olivine 48 geomagnetic 47 ENSO 47 temperate regions 47 cometary 47 radiocarbon 47 tectonic 47 Antarctic Ice 47 Tibetan Plateau 47 glacial ice 47 migrations 47 caldera 47 magmatic 47 fossils 47 droughts 47 millenniums 47 equatorial Pacific 47 depressions 47 comets 46 sedimentary 46 stalagmites 46 eruptive 46 geological formations 46 Homo sapiens 46 hominids 46 meteorites 46 volcanoes 46 woolly mammoths 46 deformations