Related by context. Frequent words. (Click for all words.) 70 glaciation 69 Little Ice Age 63 volcanism 63 Pleistocene 62 Holocene 62 mass extinction 60 Pliocene 59 mass extinctions 57 atmospheric circulation 57 greenhouse warming 56 Ordovician 56 Cretaceous 56 mid latitudes 56 atmospheric carbon dioxide 56 Eocene 55 plate tectonics 54 volcanic eruptions 53 ENSO 52 Precambrian 52 mammoths 51 atmospheric CO2 51 Ice Age 51 crustal 51 extinctions 50 diatoms 50 atmospheric concentrations 50 Triassic 50 anthropogenic 50 isotopic 50 El Niño 50 upwelling 49 volcanic activity 49 sunspots 49 sunspot 48 La Niña 48 climatic 48 El Nino 48 gamma ray burst 48 radiocarbon 48 La Nina 48 tectonics 48 eruptive 48 geologic 47 Tunguska 47 speciation 47 glacial 47 seismicity 47 Homo sapiens 47 troposphere 47 lava flows 47 tectonic 47 ozone depletion 47 equatorial Pacific 47 PETM 47 permafrost 47 temperate regions 47 hydrothermal 47 subduction zones 47 Antarctic Ice 46 Neanderthals 46 paleo 46 albedo 46 hominids 46 climatological 46 perturbation 46 atmospheric chemistry 46 Mesozoic 46 glaciers 46 subduction zone 46 epochs 46 Proterozoic 45 greenhouse gas concentrations 45 coral bleaching 45 climatologists 45 woolly mammoth 45 mountain glaciers 45 Homo erectus 45 Iapetus 45 cosmic microwave background 45 dinosaurs 45 ocean currents 45 supernovae 44 sediments 44 equatorial 44 Greenland ice 44 Oetzi 44 abundances 44 Earth crust 44 comets 44 geomagnetic 44 latitudes 44 cosmic ray 44 olivine 44 Droughts 44 nucleation 44 sedimentary rock 44 eruption 43 gamma ray bursts 43 caldera 43 magnetosphere 43 supernova