Related by context. Frequent words. (Click for all words.) 63 glaciations 61 glaciation 59 Jurassic Period 59 interglacial period 58 retreating glaciers 58 Cretaceous Period 57 Pleistocene era 56 marine sediments 56 glacial retreat 55 Younger Dryas 55 Late Cretaceous 55 melting glacier 54 landforms 54 subarctic 54 terrestrial ecosystems 54 supercontinent 54 Beringia 54 lake sediments 54 phytoplankton blooms 53 barrens 53 upwellings 53 Little Ice Age 53 Pleistocene 53 glaciers 53 glacial 53 glaciers melt 53 continental crust 53 landmasses 53 snow melt 52 moraines 52 atmospheric methane 52 ice melts 52 Cambrian explosion 52 Gypsy moths 52 megafauna 52 icecaps 52 glaciated 52 continental drift 51 dinosaurs roamed 51 freeze thaw cycles 51 mudflat 51 thawing permafrost 51 sediments 51 solar nebula 51 snowmelt 51 coulees 51 planetesimals 51 Snowball Earth 51 Arctic permafrost 51 melting permafrost 51 ocean ridges 51 interglacial 50 glacial melt 50 lavas 50 fossilization 50 meltwater 50 temperate forests 50 Carboniferous 50 Quaternary 50 glacial melting 50 poleward 50 sediment 50 biogeochemical 50 periodical cicadas 50 glacier 50 volcanism 50 radiocarbon dated 49 Weddell Sea 49 freshwater marshes 49 cryosphere 49 warmer winters 49 Ordovician 49 icecap 49 desiccation 49 Paleocene 49 lithosphere 49 storminess 49 extirpated 49 upwelling 49 ice jams 49 mountain glaciers 49 Burgess Shale 49 torrential storms 49 Greenland glaciers 49 hydrothermal vent 49 lava tubes 49 permafrost 49 Petermann Glacier 48 Lake Agassiz 48 arctic tundra 48 magmas 48 deciduous forests 48 wintering grounds 48 polar vortex 48 mountain pine beetles 48 streambeds 48 Soil erosion 48 diatoms 48 oceanic crust 48 hydrological cycle 48 plate tectonics