Related by context. All words. (Click for frequent words.) 68 KT boundary 65 Permian extinction 64 Toba eruption 63 Tertiary Period 62 Cenozoic Era 62 KT extinction 62 Chicxulub 61 Paleocene Eocene Thermal Maximum 61 earliest hominid 60 Chicxulub crater 60 Laurasia 60 basaltic rocks 60 Palaeozoic sedimentary 59 Hellas Basin 59 Permian Triassic boundary 58 ichthyosaur 58 Permian Triassic extinction 58 GJ#b 58 Tunguska Siberia 58 supercontinent 58 dinosaur extinction 58 Maastrichtian 58 Cretaceous Tertiary boundary 58 Kepler #b 58 Permian Period 58 G#.# +#.# 58 ramidus 58 Permian Triassic 58 COROT 7b 57 Cretaceous Tertiary 57 sediments deposited 57 smallest exoplanet 57 Chicxulub Crater 57 Iguanodon 57 cratons 57 mass extinction 57 glaciations 57 Chicxulub impact 57 hominid fossil 57 southern supercontinent 57 crinoid 57 Tunguska meteorite 57 Cambrian Explosion 57 sedimentary deposits 57 TrES 4 57 Mount Tambora 57 Neogene 57 Laetoli Tanzania 57 Gamma ray burst 57 seafloor sediments 57 Devonian Period 57 cataclysmic eruption 57 Neoproterozoic 57 Tunguska explosion 57 Cretaceous Paleogene 57 magma ocean 56 sulfur isotope 56 ejecta blanket 56 Syrtis Major 56 long necked sauropod 56 SN #A 56 isotopic compositions 56 Palaeocene Eocene Thermal Maximum 56 planktonic foraminifera 56 flood basalts 56 Gigantopithecus 56 Cambrian Period 56 Gondwanaland 56 tuffaceous rocks 56 glaciers retreated 56 brightest supernova 56 Tunguska Event 56 Deccan Traps 56 meteorite bombardment 56 Carboniferous Period 56 basalt volcanic 56 Cambrian explosion 56 called lobate scarps 56 lunar crust 56 supervolcano 56 Snowball Earth 56 supervolcanoes 56 fissure eruption 56 interglacial period 56 silicate rocks 56 floresiensis 56 carbonaceous chondrite 56 meteor impacts 56 partial skeleton 56 Fomalhaut b 56 interglacial periods 56 WASP #b 56 QQ# 56 Cretaceous periods 56 paleomagnetic 55 Comet Halley 55 Cryogenian period 55 Linheraptor 55 moons orbiting 55 Siberian permafrost 55 lungless frog 55 carbonaceous chondrites 55 Ontario Lacus 55 Jurassic Period 55 calderas 55 coprolite 55 Cryogenian 55 lunar meteorites 55 conodonts 55 spinels 55 Sumatra Andaman earthquake 55 glaciation 55 continental crust 55 Corot 7b 55 sedimentary layers 55 stony meteorites 55 Eocene epoch 55 Arabia Terra 55 Pleistocene Ice Age 55 Mount Bosavi 55 Linhenykus 55 carbon cenospheres 55 ancient hominid 55 Oligocene epoch 55 ferric oxides 55 Great Oxidation Event 55 Late Devonian 55 planet Uranus 55 moonlet 55 Pleistocene epoch 55 deglaciation 55 lobe finned fishes 55 earliest tetrapods 55 Acanthostega 55 asteroidal 55 chondritic meteorites 55 tectonic plate movements 55 Siberian Traps 54 Early Cretaceous 54 ancient supercontinent 54 Miocene epoch 54 Anchiornis huxleyi 54 Ayles Ice Shelf 54 Argentinosaurus 54 Cretaceous Period 54 venomous lizards 54 olivine crystals 54 moraines 54 quartz grains 54 Sauropods 54 Triassic Period 54 phyllosilicate 54 glaciers receded 54 icy comets 54 spiral nebulae 54 electron neutrino 54 comet McNaught 54 Lake Vostok 54 Spinosaurus 54 concretions 54 tectonic plate dives 54 plagioclase 54 coccolithophores 54 mineral olivine 54 Pleistocene Age 54 Sarahsaurus 54 turbidites 54 Hadean 54 dromaeosaurid 54 necked dinosaur 54 Theropods 54 Icadyptes 54 SN #cr 54 planetary nebula 54 lunar highlands 54 CoRoT #b 54 Laetoli 54 Type Ia supernova 54 Orcus Patera 54 GJ #b [001] 54 speleothems 54 Greenland glacier 54 glacier calving 54 Triassic Jurassic 53 Hanny Voorwerp 53 selembu calves 53 A. ramidus 53 oxygen isotope 53 dustier stormier atmosphere 53 Confuciusornis 53 Ordovician extinction 53 Argentavis 53 golden toad 53 Europasaurus 53 Chile Chaiten volcano 53 plesiosaurs 53 stalactite 53 hominid species 53 dromaeosaurs 53 marine sediments 53 Castorocauda 53 Younger Dryas 53 H. habilis 53 winged dinosaur 53 magnetic polarity 53 spacecraft flyby 53 Tarantula nebula 53 cinder cones 53 Quaoar 53 robustus 53 Denisovan 53 lobate scarps 53 angiosperm 53 fossilized footprints 53 Toutatis 53 Cretaceous Paleogene boundary 53 basaltic 53 mammal lineages 53 blue supergiant 53 basaltic lava 53 gaseous planet 53 molten magma 53 striations 53 silicified outcrops 53 interacting galaxies 53 Permo Triassic 53 nicknamed Ardi 53 Ediacaran Period 53 Tharsis Rise 53 smoker vents 53 isostatic rebound 53 Jupiter moon Io 53 halite 53 galaxy M# [001] 53 PancakeCroc 53 abyssal plains 53 seafloors 53 horseshoe shaped crater 53 sulfur isotopes 53 Saturn moon Mimas 53 Antennae Galaxies 53 quartz feldspar porphyry intrusive 53 martian rocks 53 Stegodon 53 hornblende 53 volcano Olympus Mons 53 Lengai 53 reionization 53 volcanic moon Io 53 protoplanet 53 cryovolcanism 53 supervolcano eruption 53 sub glacial lakes 53 strange quark 53 Repenomamus robustus 53 super perigee moon 53 volcanic basalt 53 fossilized skull 53 Shiveluch 53 SN #D 53 Taurus Littrow Valley 53 Comet Shoemaker Levy 53 chalcedonic silica 53 undersea volcanoes 53 Ardipithecus ramidus 53 cosmic cannibal 53 explosive volcanism 53 theropod dinosaur 53 Homo sapiens evolved 53 bonebed 53 Neanderthals Homo neanderthalensis 53 galaxy M# [002] 53 carbon spherules 53 Haast eagle 52 extinct volcanoes 52 abyssal plain 52 felsic intrusions 52 supernova explosion 52 herbivorous dinosaurs 52 lobate 52 spherules 52 supernova SN 52 Upsilon Andromedae b 52 evaporite 52 anamensis 52 type Ia supernova 52 ejecta 52 Last Glacial Maximum 52 magmatism 52 Himalayan river basins 52 Ediacaran 52 Chazy Reef 52 receding glacier 52 Saturn outermost ring 52 microfossils 52 sauropodomorphs 52 Megathrusts occur 52 Burgess Shale 52 Kuiper Belt Object 52 Ice Age mammals 52 cenospheres 52 ALH# 52 trilobites 52 Gusev crater 52 spiral galaxy NGC 52 Kirishima range 52 Wilkinson Microwave Probe 52 atmospheric methane 52 oceanic crust 52 VIDEO Egyptian mummies 52 fossilized creatures 52 Omega Centauri 52 mass extinctions 52 lunar perigee 52 ionized hydrogen 52 placental mammals 52 protoplanets 52 Denisova Cave 52 stratovolcano 52 Murchison meteorite 52 Pliocene epoch 52 Late Ordovician 52 birdlike dinosaur 52 harlequin frogs 52 isotope ratios 52 extinct mammal 52 Mistaken Point 52 constellation Cassiopeia 52 Panderichthys 52 Bug Nebula 52 Fossilised 52 hematite goethite 52 long necked sauropods 52 multi celled 52 Cretaceous Tertiary KT 52 asthenosphere 52 Eagle Nebula 52 supercontinent Pangaea 52 Dromomeron 52 mammal fossils 52 Earthly contamination 52 Sagittarius B2 52 Miocene Epoch 52 pallasite 52 carboniferous 52 mammal extinctions 52 Middle Miocene 52 felsic dike 52 Neanderthal fossils 52 faunas 52 basaltic rock 52 ostracods 52 volcanism 52 Deccan volcanism 52 meteorite fragments 52 Homo ergaster 52 curved tusks 52 terrestrial vertebrates 52 chondrules 52 andesite flows 52 Heterodontosaurus 52 Dilophosaurus 52 carbon isotope ratios 52 carbon isotopes 52 filamentary structures 52 AU Mic 52 Woolly mammoths 52 Jakobshavn 52 lunar magma 52 moon Enceladus 52 Cosmic Microwave Background 52 Caloris 52 Liang Bua 52 lavas 52 supernovae explosions 52 crustal rocks 52 Sauropod 52 Plesiosaurs 52 radiocarbon dated 52 tektites 52 species Ardipithecus ramidus 52 massifs 52 Paleogene 52 galactic disk 52 isopods 52 retreating glaciers 52 CMB radiation 52 Denisova cave 51 CAIs 51 El Chichon 51 claystone 51 Late Heavy Bombardment 51 weakly interacting 51 olivines 51 moon Io 51 zodiacal light 51 multicellular creatures 51 homo erectus 51 pyroclastic 51 glaciers melted 51 olivine rich 51 cometary material 51 found circling Gliese 51 volcanic craters 51 pink iguana 51 Laurentide ice sheet 51 Neoproterozoic era 51 Swift Tuttle 51 nebular 51 Eocene Epoch 51 fossilisation 51 ammonites 51 elliptical galaxy 51 Antarctic ozone 51 dinosaur precursors 51 mya 51 merging galaxies 51 stromatolites 51 placentals 51 Gliese #g 51 GQ Lupi 51 lapilli 51 Hesperian Epoch 51 volcanic lava flows 51 astronomer Clyde Tombaugh 51 stromatolite 51 meteorite impacts 51 Comet Tempel Tuttle 51 bony fishes 51 past boninite lavas 51 silicate dust 51 solar nebula 51 semidesert 51 zodiac constellations 51 quartz feldspar gneiss 51 Peony nebula star 51 starlike object 51 P/# A2 51 gabbros 51 Type 1a supernova 51 Quaternary 51 quartz feldspar 51 intrinsic brightness 51 Antarctic glacier 51 woolly rhinoceros 51 infall 51 hydrated silica 51 moon Mimas 51 Cabeus crater 51 Gisela Winckler 51 carbonate minerals 51 megaquakes 51 sauropod dinosaurs 51 molar tooth 51 andesitic rocks 51 molten rocks 51 Upper Triassic 51 tyrannosaurids 51 hydrothermal activity 51 Holocene epoch 51 Paleocene Eocene 51 exo planet 51 Anthony Barnosky 51 mitochondrial Eve 51 SN #E 51 deep convective clouds 51 gravitational tides 51 fault scarps 51 Kuiper belt objects 51 Bullet Cluster 51 stony meteorite 51 Martian meteorite 51 foraminifera 51 Late Cretaceous Period 51 Dakosaurus andiniensis 51 isotopic composition 51 galactic alignment 51 V# Mon 51 Middle Pleistocene 51 permanently shadowed craters 51 volcanic lava 51 mosasaurs 51 Middle Awash 51 Gliese #c 51 moon gravitational pull 51 horned Triceratops 51 snail shells 51 Giganotosaurus 51 cometary dust 51 goethite 51 felsic tuff 51 Henize #-# 51 waitress Ingrid Sufan 51 graphite whiskers 51 Surtsey 51 magmatic kimberlite 51 chondritic 51 Anisotropy Probe 51 sea scorpions 51 fossilized pollen 51 dinosaur species 51 constellation Andromeda 51 thrust faulting 51 Hot Jupiters 51 Navajo Sandstone 51 jovian 51 warmings 51 Beta Pictoris 51 BLG #Lb 51 Plateosaurus 51 HL Tau 51 Oviraptor 51 seabed sediments 51 acid leached 51 asteroid impacts 51 Trifid Nebula 51 fearsome Tyrannosaurus rex 51 Brontomerus 51 ichthyosaurs 51 emission nebula 51 oxygen isotopes 51 crystalline silicates 51 geochronology 51 Sumatran earthquake 51 known bird Archaeopteryx 51 orbital eccentricity 51 tholins 51 hydrothermal springs 51 Kuiper Belt object 51 quartz feldspar porphyries 51 glacial meltwater 51 Baptistina 50 Athabasca sandstone 50 barred spiral galaxy 50 Laurentide Ice Sheet 50 geological strata 50 solidified lava 50 Columbian mammoths 50 Noachian era 50 Massospondylus 50 meteoroid 50 Carcharodon megalodon 50 species Australopithecus afarensis 50 Dikika 50 Tycho supernova 50 supergiant stars 50 prehistoric lizard 50 kimberlite breccia 50 phyllosilicates 50 heavily cratered 50 Siple Dome 50 horned dinosaur 50 Keeling Curve 50 NASA Wilkinson Microwave 50 Tianyulong 50 Lyrid meteor shower 50 carnivorous dinosaur 50 Neutron stars 50 fluorapatite 50 HIP #b 50 igneous rocks 50 megalodon 50 feathered dinosaur 50 Buckminsterfullerene 50 evaporite deposits 50 moon Mab 50 Hominids 50 sauropod dinosaur 50 equatorial bulge 50 Lagoon Nebula 50 Soputan 50 RS Ophiuchi 50 circular depressions 50 hippopotamus bones 50 Nili Fossae 50 Ediacara 50 ah dus 50 disseminated chalcopyrite 50 duckbilled dinosaur 50 lunar craters 50 Tunguska 50 H. erectus 50 kimberlite outcrop 50 GRB #B 50 Majungatholus 50 elemental composition 50 ornithischians 50 Yellowstone caldera 50 Shoemaker Levy 50 Late Jurassic 50 planetesimals 50 constellation Aquarius 50 Guanlong wucaii 50 Martian permafrost 50 australopithecines 50 interstellar dust grains 50 carbonate globules 50 moon permanently shadowed 50 dinosaur specimens 50 supercontinent Pangea 50 turbulent eddies 50 constellation Virgo 50 isotope composition 50 HARPS spectrograph attached 50 galaxy redshift 50 Hominid 50 silicate minerals 50 hadrosaurs 50 planet Gliese #g 50 habilis 50 pillow lava 50 exoplanets orbiting 50 trilobite 50 pyrrhotite chalcopyrite 50 Paisley Caves 50 feathered dinosaurs 50 megafauna 50 Galileo spacecraft 50 hominid skeleton 50 forams 50 komatiites 50 Repenomamus 50 CoRoT 7b 50 active volcanism 50 intraplate 50 Ordovician 50 Neanderthal bones 50 brachiopods 50 fossilized claw 50 Arsia Mons 50 photosphere 50 Giovanni Cassini 50 juvenile Columbian mammoth 50 fossilized dinosaur dung 50 comet Tempel Tuttle 50 crinoids 50 earths crust 50 chondrites 50 Saturn Enceladus 50 Titan Saturn 50 La Conchita perched 50 Turiasaurus 50 Cenozoic 50 shadowed craters 50 Archeologists unearthed 50 sulphidic 50 amphibolite facies 50 Aram Chaos 50 ocean basins 50 Domoic acid neurotoxin 50 Andaman Islands quake 50 interstellar cloud 50 Martian meteorites 50 giant squid Architeuthis 50 fossilized shells 50 Norris Geyser Basin 50 martian meteorites 50 warm blooded vertebrates 50 Allende meteorite 50 steppe mammoth 50 Late Miocene 50 sundog 50 Paranthropus 50 microscopic specks 50 basalt rocks 50 iron sulphides 50 distant supernovae 50 geoneutrinos 50 geoglyphs 50 strangelet 50 steam eruptions 50 Crab Nebula 50 depositional environment 50 runaway thermonuclear 50 PSR B# +# 50 permanently shadowed lunar 50 fossilized skulls 50 interstellar dust clouds 50 diplodocus 50 igneous rock 50 SN #gy 50 windblown sand 50 Qumran caves 50 Ares Vallis 50 Mariana Arc 50 sauropod skulls 50 duck billed hadrosaur 50 magnetic monopoles 50 lynx kittens 50 planet Nibiru 50 volcanic ridges 50 therizinosaurs 50 lunar soil 50 Fornax cluster 50 lithosphere 50 Nectocaris 50 interglacial 50 peccary 50 hieroglyphic inscription 50 Seitaad 50 olivine 50 Type Ia 50 Comet 9P/Tempel 1 50 hydroxyl molecules 50 herbivorous dinosaur 50 isotopic ratios 50 Bedout 50 Cygnus X 50 Microraptor gui 50 Deccan eruptions 50 Tycho supernova remnant 50 biogeographical 50 amphibolites 50 Stromatolites 50 matter antimatter asymmetry 50 Valles Marineris 50 Late Triassic 50 Australopithecus sediba 50 Cassini flyby 49 Felsic 49 Samuel Oschin Telescope 49 Paleocene 49 Pu'u O'o crater 49 Homo erectus evolved 49 Chandra Observatory 49 invertebrate animals 49 mangabey 49 Taung child 49 boreal regions 49 Fram Strait 49 Orrorin tugenensis 49 primitive hominid 49 noble gases 49 Martian volcanoes 49 lava flowed 49 oxygen isotope ratios 49 tectonic plate slides 49 mud volcanoes 49 subsurface ocean 49 Herto 49 reionization epoch 49 Nasca Lines 49 planetary nebulas 49 Phanerozoic 49 Late Cretaceous 49 Juravenator 49 mitochondrial genome sequence 49 constellation Carina 49 pliosaur ferocious predator 49 carnivorous mammal 49 Messinian 49 dust mote 49 H. floresiensis 49 Appy Sluijs 49 Sumbawa Island under 49 Troodon 49 Magellanic Stream 49 X ray pulses 49 fossilized coral 49 mitochondrial genomes 49 lava fountains 49 hydrated minerals 49 BP Piscium 49 gravitational interaction 49 granitoids 49 Martian crater 49 Hesperonychus 49 meteorite 49 colliding galaxies 49 Antarctic Dry Valleys 49 starburst galaxies 49 compressional 49 megathrust earthquake 49 Utahraptor 49 gravitational interactions 49 Saturnian moons 49 Quadrantids 49 NEAs 49 Tarantula Nebula 49 arctic plains 49 carnivore tooth 49 Coma Cluster 49 grabens 49 Ohmoto 49 Mount Vesuvius buried 49 Shinmoedake 49 pediment gravels 49 Ithaca Chasma 49 Sagittarius dwarf galaxy 49 petroglyphs carved 49 ostracodes 49 Hydrothermal vents 49 Geologically speaking 49 Cretaceous Tertiary extinction 49 Galaxy Evolution 49 cu Oase 49 transiting exoplanet 49 equatorial plains 49 infrared spectral 49 Darwinopterus 49 erectus 49 mosque minaret taller 49 Hiker survives 49 Tibetan Plateau 49 Helix Nebula 49 filamentary structure 49 terrestrial vertebrate 49 fossilized specimens 49 primitive meteorites 49 hydrothermal fluid 49 Sahelanthropus tchadensis 49 Jurassic sandstone 49 azurite 49 Goldilocks planet 49 Prototaxites 49 Kaguya spacecraft 49 gypsum crystals 49 carbonaceous material 49 Pavonis Mons 49 Chilean Atacama Desert 49 Alycia Weinberger 49 silicon monoxide 49 volcanically active 49 Chicxulub asteroid 49 fossil skeleton 49 anhydrite 49 exosphere 49 sediba 49 Halley comet 49 cherts 49 volcanic sediments 49 spews ash 49 bolide 49 interstellar dust particles 49 galaxy NGC 49 Arches Cluster 49 coriacea 49 volcaniclastics 49 Iapetus Saturn 49 Indricotherium 49 Archaean 49 presolar grains 49 icecap 49 Gondwana supercontinent 49 Mojoceratops 49 Tambora eruption 49 planetary nebulae 49 Raptorex 49 siderite 49 ignimbrite 49 Caloris basin 49 saber tooth cats 49 Ventastega 49 Hadar Ethiopia 49 Aardonyx 49 Mount Mazama 49 Dunkleosteus 49 constellation Vulpecula 49 kyr 49 X ray binaries 49 volcanic tuff 49 theropod 49 Carboniferous 49 volcanic magma 49 baryonic 49 ferruginous 49 deepest darkest abyss 49 Paranthropus robustus 49 polar vortex 49 giganteus 49 paleoclimatic 49 constellation Eridanus 49 dense clumps 49 Veil Nebula 49 Dumbbell Nebula 49 spiny anteater 49 karst limestone 49 Lake Nyos 49 REE enriched 49 wrinkle ridges 49 Guatemala sinkhole 49 Shackleton crater 49 smallest extrasolar planet 49 Late Paleozoic 49 smallest exoplanets 49 megadrought 49 SN #C 49 loess 49 glacial fjord 49 anorthosite 49 atmospheric CO2 levels 49 Pu'u O'o 49 Cat Paw Nebula 49 rotifer 49 sunlike star 49 Ileret 49 thermal vents 49 cluster NGC 49 eruptive phase 49 huxleyi 49 Jurassic limestone 49 circumstellar 49 Wassonite 49 erosional 49 glacial retreat 49 parasiticus 49 equatorial latitudes 49 curved beak 49 RQ# 49 limonitic 49 XTE J# 49 methane clathrates 49 Ice Ages 49 caecilian 49 monotreme 49 Fermi telescope 49 calcite 49 Perseus cluster 49 observable universe 49 SNR #-#.# 49 icy moons 49 ankylosaur 49 circumstellar disk 49 silica carbonate 49 Cenozoic era 49 Gawis 49 Pleiades star 49 NASA Voyager spacecraft 49 Makemake 49 clasts 49 brecciated silicified 49 Navajo sandstone 49 Deep Impact probe 49 sea scorpion 49 silicate grains 49 fossilized remains 49 globulars 49 Epsilon Aurigae 49 Haumea 49 reflection nebula 49 Oort cloud 49 crurotarsans 49 Venusian atmosphere 49 coronal loop 49 ornithopod 49 Ardipithecus 49 mineral hematite 49 Cenomanian 49 noctilucent clouds 49 antiparticle 49 fossilized dinosaur eggs 49 serpentinized 49 basalts 49 axial tilt 49 tectonic activity 49 archeopteryx 49 Asilisaurus 49 Uberabasuchus 49 Au Cu mineralization 49 VY Canis Majoris 49 fossils unearthed 49 spicule 49 Phoebe orbits 49 metamorphic rock 49 planetesimal 49 Comet LINEAR 49 ULIRGs 49 name Mesonychoteuthis hamiltoni 49 Noachian 48 meteoritic material 48 hydrothermally 48 structural lineaments 48 Martians invading 48 biosignatures 48 ivory flutes 48 Velafrons 48 marsupial lion 48 permafrost melts 48 bird Archaeopteryx 48 Cosmic Microwave Background CMB 48 red supergiants 48 Petermann Glacier 48 Terra Sirenum 48 Melas Chasma 48 Precambrian 48 red supergiant 48 moonlets 48 heliosheath 48 constellation Scorpius 48 magmas 48 Jovian atmosphere 48 astronomical alignments 48 pillow basalts 48 volcanic caldera 48 GRB # 48 Gondwanan 48 Kihansi spray toad 48 Palaeozoic era 48 Caloris Basin