Related by context. Frequent words. (Click for all words.) 59 landmasses 49 Cretaceous Period 48 Gondwana 48 Late Cretaceous 47 multicellular 47 lithosphere 47 continental drift 46 single celled organisms 46 hominins 46 tetrapods 46 continental crust 46 trilobites 46 Fertile Crescent 45 primordial soup 45 plate tectonics 45 multicellular organisms 45 Pleistocene 45 oceanic crust 45 Ross Ice Shelf 44 Earth crust 44 Homo sapiens 44 fossils 44 dinosaurs 44 single celled 44 Archaea 44 tyrannosaurs 44 anatomically modern 44 microfossils 44 Carboniferous 44 theropod 44 sedimentary rock 44 megafauna 44 Ardipithecus 43 lavas 43 mammoths 43 Mesozoic 43 Neanderthals 43 ocean ridges 43 Weddell Sea 43 Ellesmere Island 43 carnivorous dinosaurs 43 interbred 42 Inca empire 42 Neandertals 42 sediments 42 magma chamber 42 marine sediments 42 Cretaceous 42 oxygen isotopes 42 Tiktaalik 41 Paleocene 41 retreating glaciers 41 homo sapiens 41 genetically distinct 41 glaciation 41 crustal 41 woolly mammoth 41 lineages 41 lake sediments 41 interglacial period 41 Australopithecus 41 tyrannosaur 41 Etruscans 41 heterochromatin 41 Homo habilis 40 Homo erectus 40 marine reptiles 40 hominids 40 geologically 40 Neandertal 40 Ordovician 40 sedimentary rocks 40 clades 40 Kuiper belt 40 archaea 40 Antarctic peninsula 40 Wilkins Ice Shelf 40 kingdoms 40 landforms 40 faultline 40 Paleozoic 40 hunter gatherers 40 Homo Sapiens 40 millennia 40 Voyager spacecraft 40 theropods 40 earth crust 40 middens 40 evolutionarily 40 ocean currents 40 diatoms 39 Eocene 39 protectorates 39 millenniums 39 prehistory 39 colonies 39 prehistoric 39 ancient Mesopotamia 39 mitochondrial genome 39 Paabo 39 calcite