Related by context. Frequent words. (Click for all words.) 65 interglacial period 64 interglacial 61 Younger Dryas 60 Little Ice Age 59 glaciation 58 Medieval Warm Period 55 El Ninos 54 megafauna 54 Cretaceous Period 53 retreating glaciers 53 Late Cretaceous 52 greenhouse warming 52 volcanism 52 equatorial Pacific Ocean 52 Pleistocene 51 marine sediments 51 mass extinctions 51 equatorial Pacific 51 continental drift 50 lavas 50 glaciers 50 lake sediments 50 lithosphere 50 glacial melt 50 Pliocene 49 mountain glaciers 49 Holocene 49 Neandertals 49 equatorial regions 49 mid latitudes 49 oceanic crust 49 sunspots 48 Antarctic Peninsula 48 sunspot activity 48 Homo sapiens 48 sunspot cycle 48 hydrological cycle 48 mass extinction 48 Weddell Sea 48 Antarctica 48 plate tectonics 48 scarps 48 glacial melting 48 volcanic eruptions 48 volcanic activity 48 Ross Ice Shelf 48 Volcanic eruptions 48 Ordovician 48 icecap 48 geologic 48 Quaternary 47 subtropical regions 47 Wilkins Ice Shelf 47 Ardipithecus 47 radiocarbon dating 47 permafrost 47 NSIDC 47 zircons 47 marine reptiles 47 terrestrial ecosystems 47 journal Geology 47 Ellesmere Island 47 microfossils 47 decadal 46 polar caps 46 genus Homo 46 anthropogenic climate 46 Polar Regions 46 hominins 46 Carboniferous 46 mammoths 46 substorms 46 hotter summers 46 epochs 46 melting permafrost 46 woolly mammoths 46 Precambrian 46 oxygen isotopes 46 Oetzi 46 PETM 46 Denisovans 46 Eocene 45 geologically active 45 continental crust 45 geomagnetic 45 sediment cores 45 polar regions 45 Antarctic peninsula 45 millenniums 45 ENSO 45 Iapetus 45 lava flows 45 northern latitudes 45 dinosaurs roamed 45 crustal 45 sedimentary rocks 45 icecaps 45 El Nino phenomenon 45 Cretaceous 44 La Nina 44 equinoxes