Related by context. Frequent words. (Click for all words.) 71 supercontinent 63 landmasses 62 Jurassic Period 62 Cretaceous Period 61 Late Triassic 59 Early Cretaceous 58 Late Cretaceous 57 lithosphere 56 Gondwana 56 placental mammals 56 continental crust 56 H. erectus 56 Cenozoic 55 unicellular 55 carnivorous dinosaur 55 Mesozoic 54 volcanic islands 54 Archaean 54 Ross Ice Shelf 54 horned dinosaur 54 theropod 54 ocean ridges 54 megafauna 53 Columbian mammoth 53 theropods 53 Petermann Glacier 53 grassy plains 52 Paleocene 52 feathered dinosaurs 52 stromatolites 52 Fossilized 52 continental drift 52 H. sapiens 52 supervolcano 52 Homo sapiens 52 multicellular 52 erectus 52 undersea volcanoes 52 oceanic crust 52 Carboniferous 52 carnivorous dinosaurs 52 Valles Marineris 51 tyrannosaur 51 landmass 51 Weddell Sea 51 polar vortex 51 anatomically modern 51 genetically distinct 51 montane 51 igneous rocks 51 temperate forests 51 Neandertals 51 radiocarbon dated 51 plate tectonics 51 trilobites 50 solar nebula 50 interbred 50 Siberian permafrost 50 Precambrian 50 basaltic 50 Archaea 50 baleen whale 50 lavas 50 Earth crust 50 British protectorate 50 genus Homo 50 sauropod 50 Teletran Sky Spy 50 Australopithecus 50 heavily cratered 50 Beringia 50 subduction 50 tetrapods 50 Ellesmere Island 50 interglacial period 49 metamorphic rocks 49 planetesimals 49 volcanically active 49 schists 49 Homo erectus 49 subduction zones 49 sedimentary rock 49 interglacial 49 Cretaceous 49 Pleistocene 49 Pleistocene era 49 tetrapod 49 hominins 49 marine reptiles 49 equatorial regions 49 snail shells 49 tectonic plate 49 Oort Cloud 49 Namib Desert 49 Olmecs 49 angiosperms 49 Fertile Crescent 49 crustal 48 anthropoids 48 deglaciation 48 hominids