Related by context. Frequent words. (Click for all words.) 71 supercontinent 62 landmasses 58 Cretaceous Period 56 Beringia 55 carnivorous dinosaurs 55 megafauna 55 Late Cretaceous 54 volcanic islands 54 continental crust 54 prokaryotes 53 H. erectus 53 Homo sapiens 53 continental drift 53 clades 53 single celled organisms 53 temperate forests 53 multicellular 53 tyrannosaurs 52 lineages 52 lithosphere 52 archaea 52 stromatolites 52 oceanic crust 52 hominins 51 theropods 51 Denisovans 51 trilobites 51 Gondwana 51 marine sediments 51 Cambrian explosion 51 mammoths 51 Neandertals 51 Archaea 51 multicellular organisms 51 ocean ridges 51 solar nebula 51 Milky Way Galaxy 50 landmass 50 woolly mammoths 50 epochs 50 foraminifera 50 Fertile Crescent 50 feathered dinosaurs 50 terrestrial ecosystems 50 dinosaurs 50 sedimentary basins 50 fossils 50 plate tectonics 49 single celled 49 Pleistocene era 49 temperate zones 49 tetrapods 49 marine reptiles 49 biomes 48 atmospheric methane 48 Chicxulub 48 Ardipithecus 48 Younger Dryas 48 sedimentary rock 48 diatoms 48 microfossils 48 tyrannosaur 48 hominids 48 anatomically modern 48 temperate regions 48 subduction zones 48 Mesoamerica 47 monkeys apes 47 Weddell Sea 47 landforms 47 oxygen isotopes 47 optical telescopes 47 Neanderthals 47 Cyanobacteria 47 theropod 47 volcanically active 47 biodiversity hotspots 47 Titan Saturn 47 lavas 47 Earth crust 47 subtropical regions 47 Ross Ice Shelf 47 morphologically 47 glaciation 47 Pleistocene 47 Australopithecus 47 Paleocene 47 genus Homo 47 Paabo 47 Polar Regions 46 interglacial period 46 taxa 46 planetary nebulae 46 vertebrate species 46 dinosaur footprints 46 fossil 46 marine invertebrates 46 hydrothermal vent 46 supernova explosion 46 Mesozoic 46 mitochondrial genome