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(Click for frequent words.) 69 Chicxulub impact 68 iridium layer 67 Chicxulub 66 Permian extinction 65 spherules 65 Toba eruption 65 Chicxulub crater 63 GJ#b 63 KT extinction 63 lunar crust 62 Palaeocene Eocene Thermal Maximum 62 Cretaceous Paleogene boundary 62 Cretaceous Tertiary KT 62 Paleocene Eocene Thermal Maximum 62 isostatic rebound 62 protoplanet 62 foraminifera 61 volcanism 61 sedimentary deposits 61 basaltic rocks 61 Fomalhaut b 61 marine sediments 61 Permian Period 61 Snowball Earth 61 Younger Dryas 60 earliest hominid 60 Hellas Basin 60 glaciations 60 reionization 60 Last Glacial Maximum 60 lunar perigee 60 paleomagnetic 60 Kepler #b 60 Neoproterozoic 60 dinosaur extinction 60 Chicxulub Crater 59 magma ocean 59 Bedout 59 interglacial period 59 Deccan eruptions 59 supercontinent 59 radiometric dating 59 Cenozoic Era 59 deglaciation 59 ejecta 59 glaciation 59 continental crust 59 impactors 59 Cambrian Period 59 sterile neutrino 59 sediments deposited 59 Permian Triassic 58 oceanic crust 58 interglacial periods 58 Maunder minimum 58 WASP #b 58 Cretaceous Paleogene 58 forams 58 mantle plumes 58 ALH# 58 phyllosilicates 58 Cretaceous Tertiary boundary 58 spinels 58 meteor impacts 58 H. erectus 58 Eocene epoch 58 carbonate minerals 58 ejecta blanket 58 igneous rock 58 sedimentary layers 58 igneous rocks 58 chondrules 57 stromatolite 57 Mars Squyres 57 Permo Triassic 57 sulfur isotope 57 G#.# +#.# 57 stromatolites 57 Martian meteorites 57 called lobate scarps 57 hydrothermal activity 57 Type Ia supernova 57 QQ# 57 asteroidal 57 solar nebula 57 Ediacaran 57 SN#A 57 carbonaceous chondrite 57 Cretaceous Tertiary 57 mass extinction 57 Oort cloud 57 SN #A 57 Late Devonian 57 Cambrian explosion 57 Precambrian 56 komatiites 56 Corot 7b 56 cryovolcanism 56 martian meteorites 56 subsurface ocean 56 Comet Halley 56 sedimentary rock 56 Kuiper belt objects 56 supervolcanoes 56 Holocene epoch 56 Cryogenian 56 geoneutrinos 56 supernova explosion 56 meteoritic material 56 speleothems 56 subglacial 56 thrust faulting 56 AGNs 56 supervolcano 56 dromaeosaurs 56 gabbros 56 Great Oxidation Event 56 cosmic ray flux 56 SN #gy 56 ramidus 56 fissure eruption 56 magnetic polarity 56 spiral nebulae 56 NEAs 56 COROT 7b 56 Iguanodon 56 superheavy elements 56 Confuciusornis 56 TrES 4 56 bonebed 56 matter antimatter asymmetry 56 tektites 56 Laurentide ice sheet 56 coccolithophores 56 lunar meteorites 56 manto mineralization 56 GJ #b [001] 56 meteorite impacts 56 crinoid 56 wrinkle ridges 56 asteroid impacts 56 abiogenesis 56 Tertiary Period 55 radiocarbon dated 55 Early Cretaceous 55 olivine 55 Lake Vostok 55 atmospheric CO2 levels 55 substorm 55 elemental abundances 55 Orcus Patera 55 Panderichthys 55 sulphidic 55 H. habilis 55 Mojzsis 55 meteorite fragments 55 meteoroid 55 chondrites 55 moonlet 55 Nili Fossae 55 Paleocene 55 Cambrian Explosion 55 H. floresiensis 55 quartz grains 55 ocean basins 55 Heterodontosaurus 55 oxygen isotope 55 Sr Ca 55 Neogene 55 KBOs 55 coprolite 55 spacecraft flyby 55 Permian Triassic boundary 55 spicule 55 ornithischians 55 Acanthostega 55 Quaternary 55 metal zonation 55 Palaeozoic sedimentary 55 lavas 55 Deccan Traps 55 braincase 55 Oort Cloud 55 Late Heavy Bombardment 55 Ontario Lacus 55 bird Archaeopteryx 55 cratons 55 geochemists 55 Cryogenian period 55 Oligocene epoch 55 Ordovician extinction 55 asthenosphere 55 flood basalts 55 Siple Dome 55 Hadean 55 isotopic compositions 55 carbonate globules 55 Eemian 55 Baptistina 55 gaseous planet 55 Ichthyostega 54 CoRoT 7b 54 carbonaceous chondrites 54 Darnley Bay gravity 54 intrinsic brightness 54 isotopic signature 54 mammal extinctions 54 supersolid 54 magmatism 54 elemental composition 54 turbidites 54 tropical troposphere 54 Athabasca sandstone 54 cometary material 54 undersea volcanoes 54 isotopic 54 mass extinctions 54 Ordovician 54 silicate dust 54 chondritic meteorites 54 smallest exoplanet 54 compressional 54 ichthyosaur 54 Sumatra Andaman earthquake 54 Siberian Traps 54 Henize #-# 54 Antennae Galaxies 54 blackbody 54 Permian Triassic extinction 54 paleoclimate 54 mya 54 mammal fossils 54 carbon dioxide concentrations 54 isotopic composition 54 homo erectus 54 glaciers melted 54 magnetic monopoles 54 Jupiter moon Io 54 type Ia supernova 54 Microraptor gui 54 hominid species 54 phyllosilicate 54 neutrino oscillation 54 tetrapods 54 Dromomeron 54 inhomogeneities 54 exosphere 54 megafauna 54 cataclysmic eruption 54 YORP effect 54 Lake Cheko 54 peridotites 54 silicic 54 aragonite 54 Nectocaris 54 glaciers receded 54 tholins 54 Hipparcos 54 anthropogenic warming 54 scarps 54 isotopic fractionation 54 habilis 54 quasicrystal 54 zircons 54 Jakobshavn 54 oxygen isotope ratios 54 Saturn moon Mimas 54 Liang Bua 54 Gondwana supercontinent 54 hydrated minerals 54 post perovskite 54 Gusev crater 54 Valles Marineris 54 primitive meteorites 54 Pliocene 54 lithosphere 54 radiocarbon dates 54 Tianyulong 54 isotope ratios 54 Denisovan 54 magma chamber 54 paleoclimatic 54 trimers 54 interglacial 54 carbon spherules 54 P/# A2 54 RS Ophiuchi 54 magnetic reconnection 54 Homo sapiens evolved 54 gravitational redshift 54 geochronology 54 carbon cenospheres 54 fault scarps 54 lithospheric 54 H. sapiens 54 megaquakes 54 ancient hominid 54 tuffaceous rocks 54 clathrates 54 erosional 53 basalt volcanic 53 Gerard Kuiper 53 Makovicky 53 supercontinents 53 moonlets 53 meteorite bombardment 53 sedimentological 53 A. ramidus 53 atmospheric methane 53 calderas 53 gravitational microlensing 53 Tunguska asteroid 53 polar vortex 53 Antarctic Dry Valleys 53 jarosite 53 VY Canis Majoris 53 ultramafic intrusives 53 Jurassic Period 53 subducting plate 53 primitive organisms 53 grabens 53 Earths crust 53 Maastrichtian 53 microfossils 53 Argentinosaurus 53 Syrtis Major 53 supernova remnant 53 silicate crystals 53 Ardipithecus ramidus 53 Gliese #g 53 geoid 53 concretions 53 glacial retreat 53 Kuiper Belt object 53 elliptical galaxy 53 sulfate aerosol 53 icy moons 53 GRB #B 53 HD#b 53 basaltic 53 molten magma 53 noctilucent clouds 53 quantum particle 53 Dikika 53 prokaryotes 53 geological epoch 53 oxygen isotopes 53 Late Cretaceous 53 planemos 53 dustier stormier atmosphere 53 SN #C 53 polar mesospheric clouds 53 mud volcanoes 53 quartz feldspar porphyry intrusive 53 Doppler measurements 53 crustal 53 magnetite crystals 53 midlatitudes 53 seabed sediments 53 planktonic foraminifera 53 Quaoar 53 stony meteorites 53 carbonaceous material 53 brachiopods 53 radiocarbon 53 andesitic rocks 53 olivines 53 magmas 53 archeopteryx 53 lunar magma 53 basalts 53 Hesperian epoch 53 Europasaurus 53 isotope fractionation 53 redshifted 53 Einstein relativity theory 53 diatoms 53 metamorphic rock 53 partial skeleton 53 Paleocene Eocene 53 granitoids 53 Laurasia 53 Murchison meteorite 53 Santorini eruption 53 carbon isotopes 53 silicate rocks 53 antineutrinos 53 sub Athabasca unconformity 53 megathrust 53 filamentary structures 53 galaxy redshift 53 thermal inertia 53 stony meteorite 53 plutons 53 tetrapods evolved 53 Venusian atmosphere 53 Shackleton crater 53 weak gravitational lensing 53 geologically active 53 weakly interacting 53 plesiosaurs 53 GJ #b [002] 53 proton decay 53 Cabeus 53 Laurentide Ice Sheet 53 Arabia Terra 53 comet McNaught 53 halite 52 Tunguska explosion 52 Zeebe 52 conodonts 52 Middle Pleistocene 52 SNR #-#.# 52 Cenozoic era 52 Gigantopithecus 52 Sarahsaurus 52 Type Ia 52 circumstellar 52 ancient supercontinent 52 komatiitic 52 ostracods 52 abyssal plain 52 spectroscopically 52 Velicogna 52 dimming starlight 52 Spinosaurus 52 nebular 52 greenhouse warming 52 Martian craters 52 outcropping mineralized 52 Martian meteorite 52 hominin species 52 Linhenykus 52 Au Cu mineralization 52 dipole moment 52 crustal rocks 52 tyrannosaur 52 calcite 52 AB Aurigae 52 isotopic ratios 52 loess 52 Jurassic sandstone 52 Magellanic Stream 52 Rugops 52 Woese 52 magnetar 52 polar caps 52 mosasaurs 52 aerosol concentrations 52 sauropodomorphs 52 Laetoli Tanzania 52 Antarctic ozone 52 lobate scarps 52 supervolcano eruption 52 volcanic basalt 52 supersymmetric particles 52 southern supercontinent 52 megathrust earthquake 52 Tunguska Siberia 52 electromagnetic anomaly 52 Radiocarbon dating 52 Cretaceous Tertiary extinction 52 olivine rich 52 Upper Triassic 52 Gakkel Ridge 52 Cabeus crater 52 Genyornis 52 coprolites 52 Archaeopteryx 52 silicate mineral 52 radiocarbon dating 52 continental drift 52 Gondwanaland 52 seafloor sediments 52 Burgess Shale 52 kyr 52 gabbro intrusive 52 necked dinosaur 52 magnetic geophysical anomaly 52 basaltic lava 52 Dry Valleys 52 hypoxic zone 52 australopithecines 52 megaflood 52 electron neutrino 52 Argentavis 52 galactic disk 52 intraplate 52 Deccan volcanism 52 panspermia 52 sulfidic 52 subatomic particle 52 earliest tetrapods 52 comet nuclei 52 Amundsen Sea 52 subduction zones 52 Castorocauda 52 red supergiant 52 Middle Awash 52 radioactive decay 52 interannual variability 52 Ares Vallis 52 gravitational interaction 52 Eric Rignot 52 planetesimal 52 geologic 52 Medieval Warm Period 52 Cambrian Ordovician 52 McMurdo Dry Valleys 52 strange quark 52 volcanic tuff 52 glacial melting 52 Earth radii 52 megafauna extinction 52 photoemission 52 Eocene Epoch 52 cosmic strings 52 Little Ice Age 52 explosive volcanism 52 Late Triassic 52 ULIRGs 52 Wolf Rayet star 52 Siberian permafrost 52 Darwinopterus 52 crustal thickness 52 Tycho supernova 52 therizinosaurs 52 tectonic plate movements 52 spectroscopic analysis 52 dynamical processes 52 von Frese 52 Atlantic Multidecadal Oscillation 52 Stegodon 52 Saturn rings 52 mesosphere 52 meteoroid impacts 52 superposed 52 arcuate 52 dolomites 52 anthropogenic CO2 emissions 52 chimp genomes 52 Earth biosphere 52 theropod dinosaur 52 deformational 52 Late Ordovician 52 neutrino mass 52 permanently shadowed craters 52 cosmic microwave radiation 52 stellar seismology 52 tyrannosaurids 52 Gliese #c 52 mid latitudes 52 Arctic oscillation 52 lava tubes 52 megadroughts 51 Anthony Barnosky 51 heliosheath 51 olivine crystals 51 Quaternary Period 51 Bose Einstein condensates 51 NASA Wilkinson Microwave 51 ignimbrite 51 superluminal 51 Keeling Curve 51 hypervelocity stars 51 Cascadia fault 51 Yellowstone caldera 51 placental mammals 51 meteoritic 51 geological timescale 51 type Ia supernovae 51 branching corals 51 dinosaur species 51 Rayleigh scattering 51 planetary nebula 51 basaltic rock 51 Anomalous radioactivity 51 atmospheric CO 51 Iapetus 51 geothermal gradient 51 anamensis 51 lunar soil 51 volcaniclastics 51 depositional 51 Homo ergaster 51 cosmic microwave background 51 amorphous calcium carbonate 51 massive sulphide horizon 51 Palaeozoic 51 abyssal plains 51 Hurdia 51 X ray pulses 51 collisional 51 dinosaur genera 51 Tunguska 51 Hot Jupiters 51 graben 51 siderite 51 Darwinius 51 fluid inclusions 51 Homo species 51 protoplanetary disk 51 cinder cones 51 tectonic stresses 51 avian dinosaurs 51 Devonian Period 51 megalodon 51 CAIs 51 animal phyla 51 volcanogenic 51 Upper Paleolithic 51 microlensing 51 baryonic 51 warmings 51 Cenozoic 51 protoplanets 51 fossilisation 51 merging galaxies 51 circumstellar disk 51 Australopithecus 51 supernova remnants 51 polygon shaped 51 shear modulus 51 Pleistocene Ice Age 51 Anthropocene 51 elongated orbits 51 icy comets 51 olivine mineral 51 Klekociuk 51 planetary nebulae 51 kimberlite breccia 51 graphite whiskers 51 metallicity 51 thermosphere 51 mineralized intrusive 51 Paranthropus 51 Higgs bosons 51 GRBs 51 hominid fossil 51 interglacials 51 quark gluon plasma 51 biogeographic 51 filamentary structure 51 hominid evolution 51 placental mammal 51 humans Homo sapiens 51 IP geophysical anomaly 51 plate tectonics 51 ammonia hydrate 51 supergene enrichment 51 morphological evolution 51 Pliocene epoch 51 perchlorate salts 51 Toutatis 51 meridional flow 51 Type Ia supernovas 51 hydrothermal vent 51 distant supernovae 51 landforms 51 Neanderthals Homo neanderthalensis 51 Beringia 51 spherically symmetric 51 isopods 51 climate modellers 51 strangelet 51 tectonic activity 51 binary asteroid 51 Mount Tambora 51 tectonic uplift 51 Middle Paleolithic 51 quartz feldspar porphyries 51 Tunguska meteorite 51 Anchiornis huxleyi 51 Sturtian 51 structural lineaments 51 subglacial lakes 51 biosignatures 51 Carboniferous 51 eruptive activity 51 gamma ray burst 51 pnictides 51 mammal lineages 51 lake sediments 51 GRB # 51 large oceanic plateaus 51 Guanlong wucaii 51 Upper Bracemac 51 Antikythera mechanism 51 HiRISE image 51 gyres 51 Mg Ca 51 cometary dust 51 SCP #F# 51 Mesozoic mammals 51 Pavonis Mons 51 Atlantic Multidecadal Oscillation AMO 51 Abydosaurus 51 epithermal deposit 51 extinct volcanoes 51 silicates 51 Earthlike 51 cuprate superconductors 51 floresiensis 51 brightest supernova 51 jovian 51 observable universe 51 bryozoans 51 RQ# 51 sediments 51 planet Gliese #c 51 neutron spectrometer 51 mineral apatite 51 Red Rectangle 51 chondritic 51 Ventastega 51 BLG #Lb 51 vertebrate fossils 51 Epsilon Eridani 51 moonquakes 51 electromagnetic anomalies 51 Ohmoto 51 Cretaceous Period 51 perihelion 51 ultramafic rock 51 brittle deformation 51 Late Paleozoic 51 EW trending 51 hydrothermal magnetite 51 biogeochemical 51 magmatic 50 SN Ia 50 palaeo 50 Eocene 50 Icadyptes 50 proplyds 50 Cosmic Microwave Background 50 atmospheric CO2 concentration 50 bilaterally symmetrical 50 Late Jurassic 50 Phanerozoic 50 Meridiani 50 True thicknesses 50 yedoma 50 stratigraphic sequence 50 diatom 50 VD# [001] 50 IP chargeability 50 VB #b 50 osmium 50 Gamma ray burst 50 therizinosaur 50 strongly foliated 50 REE enriched 50 dwarf hippos 50 xenoliths 50 Borealis basin 50 Tiktaalik 50 Mini SAR 50 ellipsoid 50 Sulphide mineralization 50 planetesimals 50 sauropod dinosaurs 50 iceberg calving 50 moon gravitational pull 50 herbivorous dinosaurs 50 multi celled 50 Upsilon Andromedae 50 Anisotropy Probe 50 glaciers retreated 50 Sinosauropteryx 50 Paleobiology Database 50 smallest extrasolar planet 50 Indohyus 50 isotope composition 50 Cretaceous extinction 50 Rignot 50 depositional environment 50 bolide 50 polar icecap 50 Goldilocks planet 50 Prototaxites 50 homochirality 50 Otto Bliesner 50 birdlike dinosaur 50 stratiform 50 sauropod skulls 50 VTEM conductor 50 bony fishes 50 gravitational lensing 50 pyroxene 50 pterosaur 50 Ediacara 50 Allende meteorite 50 photosphere 50 extrasolar 50 ε 50 surficial 50 Upsilon Andromedae b 50 Ice Age mammals 50 active volcanism 50 anthropoids 50 volcanic lava flows 50 concretion 50 ferric oxides 50 exoplanetary 50 martian rocks 50 Radiocarbon 50 sunspot cycle 50 Velafrons 50 NASA Voyager spacecraft 50 Fig. 1A 50 pottery sherds 50 magnetars 50 Paleozoic carbonate 50 pseudogap 50 axial tilt 50 Greenland glacier 50 stalactite 50 supernova SN 50 invertebrate animals 50 Mount Bosavi 50 eudialyte 50 mineralized mafic 50 Anomalocaris 50 ocean ridges 50 z ~ 50 dwelling organisms 50 Martian equator 50 felsic dike 50 Kuiper Belt Object 50 exo planets 50 geophysically 50 Navajo Sandstone 50 bearing sulphide mineralization 50 seamount 50 hydrated electron 50 cometary 50 fossilized footprints 50 Herto 50 felsic tuff 50 Caloris basin 50 radial velocity method 50 HIP #b 50 Fram Strait 50 amphipods 50 morphologically distinct 50 circular depressions 50 rifting 50 sulfate aerosols 50 pyroclastic 50 metamorphism 50 biogeographical 50 faunas 50 recrystallized 50 sericitization 50 GZK cutoff 50 Haumea 50 polar craters 50 Kuiper belt 50 Kuiper Belt Objects 50 coronal heating 50 tectonically 50 tonalite 50 felsic intrusions 50 inner asteroid belt 50 Cretaceous sandstones 50 phreatic 50 REE bearing 50 crestal 50 Triassic Period 50 placentals 50 phytoliths 50 Repenomamus 50 altered porphyry 50 earth crust 50 microlensing events 50 Earth asteroids NEAs 50 Homo antecessor 50 sediba 50 hydrothermal springs 50 Osedax 50 orogenic 50 tropopause 50 retreating glaciers 50 anticlines 50 sheet Summerhayes 50 planets astronomers 50 hydrated silica 50 quartz tourmaline veining 50 chalcedonic silica 50 crackle breccia 50 sunspot activity 50 Laetoli 50 Chasma Boreale 50 cosmologists 50 seafloors 50 quartz adularia 50 radial velocity 50 glacial melt 50 eclipsing binary 50 lava flows 50 A. afarensis 50 submicrometer 50 warm bloodedness 50 hydrothermal fluid 50 electron pairing 50 melt inclusions 50 wavefunction 50 W boson 50 theropods 50 extrasolar planets 50 Navajo sandstone 50 pyrite halo 50 atmospheric carbon dioxide 50 carbonaceous meteorites 50 Tunguska Event 50 Martian crust 50 vanadium mineralization 50 mesospheric 50 Morganucodon 50 silcrete 50 cosmogenic 50 multi decadal 50 atmospheric aerosols 50 hadrosaur 50 secondary chalcocite 50 terrestrial ecosystems 50 subduction earthquake 50 circular magnetic anomaly 50 interstellar dust clouds 50 Bullet Cluster 50 evolutionary lineage 50 Stromatolites 50 IP chargeability anomaly 50 Von Frese 50 species Homo floresiensis 50 Higgs particle 50 landmasses 50 volcanically active 50 glacier shrinkage 50 Middle Jurassic 50 Coral bleaching 50 Pluto Charon 50 microevolution 50 supergene copper 50 pink iguana 50 Milankovitch 50 eluvial 50 microplastics 50 Glikson 50 basalt 50 Gerta Keller 50 equatorial bulge 50 Galileo spacecraft 50 niobium mineralization 50 galactic mergers 50 Heasler 50 dynamical evolution 50 surface geochemistry 50 Antarctic ozone layer 49 mitochondrial Eve 49 ostracodes 49 Saturnian 49 Reiner Gamma 49 stockwork veining 49 mineral hematite 49 tau neutrino 49 glacier calving 49 conductive anomaly 49 nucleosynthesis 49 Schrödinger cat 49 hydrothermal 49 S. tchadensis 49 magnetic substorms 49 hydrothermal vents 49 redshifts 49 mafic intrusion 49 silicate minerals 49 sedimentary strata 49 Paleozoic Era 49 Falcarius 49 microbialites 49 primate lineage 49 diorite intrusion 49 Milankovitch cycles 49 otoliths 49 seiche 49 stratovolcano 49 protists 49 Ulysses spacecraft 49 Sumatran earthquake 49 B meson 49 hazardous eruption 49 maternal lineages 49 methane hydrates 49 stegosaur 49 stratigraphically 49 Indian Ocean Dipole 49 Neanderthal extinction