Related by context. Frequent words. (Click for all words.) 63 Cretaceous Period 62 interglacial period 60 Beringia 59 Jurassic Period 58 Ice Ages 58 glaciations 58 Early Cretaceous 57 Little Ice Age 57 Late Cretaceous 56 Posted -# sec 56 Younger Dryas 56 Gondwanaland 56 interglacial 55 Late Triassic 54 Khmer empire 54 glaciation 54 marine sediments 53 supercontinent 53 subarctic 53 atmospheric methane 53 H. sapiens 53 www.thestar.com online 53 Lake Vostok 53 degrees Fahrenheit warmer 53 deglaciation 53 Medieval Warm Period 53 Pleistocene era 52 glacial retreat 52 warmings 52 severe droughts 52 Snowball Earth 52 Pleistocene 52 equatorial waters 52 Mesozoic Era 52 temperate rainforest 52 plesiosaurs 52 meteor impacts 52 equatorial Pacific Ocean 52 grassy plains 51 Archaean 51 continental crust 51 terrestrial ecosystems 51 Arctic permafrost 51 Inca Empire 51 Fertile Crescent 51 Cenozoic 51 Alpine glaciers 51 hominid species 51 Weddell Sea 51 Wilkins Ice Shelf 51 sediment cores 50 Siberian permafrost 50 Equatorial Pacific 50 permafrost 50 megafauna 50 solar irradiance 50 Radiocarbon dating 50 temperate forests 50 retreating glaciers 50 preindustrial times 50 lithosphere 50 Volcanic eruptions 50 Guatemala Zunil 50 Holocene 50 Mesolithic 50 millenniums 50 loess 50 H. erectus 50 Cambrian explosion 49 extinct volcanoes 49 oceanic crust 49 Colossal squid 49 Anthropocene 49 lake sediments 49 dinosaurs roamed 49 c Copyright Thomson Reuters 49 Carboniferous 49 news pcachia@di-ve.com 49 thawing permafrost 49 Palaeolithic 49 Greenland Ice 49 solar nebula 49 icecap 49 primate evolution 49 Pliocene 49 limestone cave 49 Neoproterozoic 49 Neandertals 49 landmasses 49 Polar Regions 49 subglacial 49 Upper Paleolithic 49 Svalbard archipelago 49 Ottoman rule 49 sparse vegetation 49 millennia 49 Ardipithecus ramidus 49 lava tubes 49 Maunder Minimum 48 taiga 48 Greenland glacier