Related by context. Frequent words. (Click for all words.) 61 interglacial period 60 retreating glaciers 60 glaciers 58 Cretaceous Period 58 supercontinent 58 glacial retreat 57 landmasses 57 glaciation 57 subarctic 57 continental crust 56 glacial melt 56 landmass 56 glaciers melt 55 Late Cretaceous 55 melting glacier 55 Pleistocene era 55 marine sediments 55 glaciated 54 interglacial 54 glacial melting 54 glacier 53 atmospheric methane 53 river deltas 53 temperate forests 53 icecaps 53 lithosphere 53 Younger Dryas 53 oceanic crust 53 mountain glaciers 53 hydrological cycle 53 icecap 53 glacial ice 53 Tibetan Plateau 53 limestone cave 52 lake sediments 52 glacial 52 continental drift 52 Arctic permafrost 52 terrestrial ecosystems 52 freshwater lakes 52 moraines 52 equatorial Pacific Ocean 52 Beringia 51 oceans 51 glacial lakes 51 glaciers melting 51 Weddell Sea 51 volcanism 51 landforms 51 Fertile Crescent 51 Quaternary 51 Pleistocene 50 Ross Ice Shelf 50 cryosphere 50 polar caps 50 dinosaurs roamed 50 glacier melt 50 meltwater 50 Volcanic eruptions 50 mountain ranges 50 degrees Fahrenheit warmer 49 Carboniferous 49 plate tectonics 49 sediments 49 Little Ice Age 49 volcanically active 49 sedimentary rock 49 Polar Regions 49 Antarctic peninsula 49 freshwater ecosystems 49 Lake Agassiz 49 lakes 49 sediment cores 48 temperate zones 48 Arctic Ocean 48 lavas 48 permafrost 48 sandstone cliffs 48 Earth crust 48 ocean ridges 48 Arctic tundra 48 megafauna 48 limestone caves 48 river valleys 48 polar ice 48 temperate regions 48 lowlands 48 rivers 48 volcanic crater 48 Pliocene 48 volcanic islands 48 poleward 48 mid latitudes 48 storminess 48 stromatolites 47 preindustrial 47 Cambrian explosion 47 Wilkins Ice Shelf 47 Greenland Ice 47 Precambrian 47 gyre