Related by context. Frequent words. (Click for all words.) 68 supercontinent 67 Gondwanaland 62 homo erectus 61 Late Triassic 61 Homo antecessor 61 faunas 60 hominid species 60 dinosaur species 59 Beringia 59 Gondwana 59 ichthyosaur 59 plesiosaurs 58 horned dinosaurs 58 horned dinosaur 58 eukaryote 58 Deccan Traps 58 stromatolites 57 Jurassic Period 57 H. erectus 57 placental mammals 57 By Rob Ollikainen 57 Indus valley 57 ancient kingdoms 57 Inca Empire 57 primitive organisms 57 hominid fossils 57 By Laurie Kulikowski 57 Columbian mammoth 57 Olmecs 56 Paranthropus 56 carnivorous dinosaur 56 phyllosilicates 56 undersea volcanoes 56 marine reptiles 56 Neolithic Age 56 lava tubes 56 carnivorous dinosaurs 56 biosignatures 56 Cretaceous Period 56 Pleistocene epoch 56 mosasaurs 56 Neoproterozoic 56 gaseous planet 56 Late Jurassic 55 australopithecines 55 hominins 55 aurochs 55 Fertile Crescent 55 fossil specimens 55 supervolcano 55 theropod 55 landmasses 55 Ardipithecus ramidus 55 Jupiter moon Io 55 Denisovans 55 fossilized skull 55 peccary 55 extinct volcanoes 55 Late Cretaceous 55 Valles Marineris 55 biogeographic 55 trilobites 55 Ventastega 55 mud volcanoes 55 Indohyus 55 feathered dinosaurs 55 Oort Cloud 54 Workers Struggles 54 IntergalaticEarth 54 sea scorpion 54 monotremes 54 Palaeolithic 54 Neutron stars 54 Sumbawa Island 54 By HARVEY SIMPSON 54 invertebrate animals 54 By JOHN NASH 54 planetary embryos 54 continental crust 54 sedimentary layers 54 chondrites 54 Early Cretaceous 54 gabbros 54 By BRIAN MCTAGGART 54 single celled 54 ammonites 54 Martian meteorites 54 volcanic islands 54 room temperature colliders 54 Burgess Shale 53 Volcano erupts 53 gaseous planets 53 megafauna 53 predatory dinosaurs 53 lithosphere 53 Scientists theorize 53 igneous rocks 53 prehistoric 53 kipunji 53 carbonate minerals 53 Archaean