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(Click for frequent words.) 66 Paleocene Eocene Thermal Maximum 65 Permian extinction 64 Cambrian explosion 64 Cambrian Explosion 62 Permian Triassic 62 Snowball Earth 62 glaciations 61 atmospheric methane 61 Late Heavy Bombardment 60 reionization 60 Ordovician extinction 60 Ediacaran 60 Ediacaran Period 60 mass extinctions 60 Neoproterozoic 59 interglacial period 59 interglacial 58 Permian Triassic boundary 58 deglaciation 58 meteorite bombardment 58 Cambrian Period 58 KT extinction 57 Hesperian epoch 57 Devonian Period 57 Palaeocene Eocene Thermal Maximum 57 Younger Dryas 57 volcanism 57 Neoproterozoic era 57 Permian Triassic extinction 57 anoxic 57 Late Devonian 57 glaciation 56 Eocene epoch 56 multicellular animals 56 KT boundary 56 Late Ordovician 56 Eemian 56 interglacial periods 56 atmospheric CO 56 supercontinent 56 mass extinction 56 Hadean Eon 55 Noachian 55 Archean Expansion 55 Neogene 55 supernova explosion 55 coccolithophores 55 iridium layer 54 Ice Ages 54 methanogens 54 primitive organisms 54 solar nebula 54 sediments deposited 54 clathrates 54 Permian Period 54 methanogenesis 54 primitive meteorites 54 Ordovician 54 Precambrian 54 Cenozoic Era 53 geological epoch 53 Oligocene epoch 53 oxygenic photosynthesis 53 Jurassic Period 53 glacial interglacial 53 GRB #B 53 Little Ice Age 53 Cenozoic 53 Pleistocene epoch 53 glacial interglacial cycles 53 hydrosphere 53 mammal extinctions 53 Paleogene 53 Phanerozoic 53 magma ocean 53 stromatolites 53 basaltic rocks 53 Last Glacial Maximum 53 anthropogenic greenhouse gas 53 SN #gy 53 terrestrial biosphere 53 Late Triassic 52 Late Cretaceous 52 Early Cretaceous 52 planetesimals 52 Miocene epoch 52 prokaryotes 52 ppbv 52 Type 1a supernova 52 osmium 52 kyr 52 Cretaceous Period 52 meteor impacts 52 GtC 52 Cryogenian 52 supersolid 52 ppmv 52 atmospheric CO2 concentration 52 tectonic plate movements 52 glacial cycles 52 Pliocene 52 TrES 4 52 Antarctic ozone 52 meteorite impacts 52 substorm 51 isotope fractionation 51 diatoms 51 abiogenesis 51 seafloor sediments 51 Acanthostega 51 Carboniferous 51 carbon dioxide concentrations 51 marine sediments 51 multicellular 51 Sumatra Andaman earthquake 51 magmatic 51 Eocene Epoch 51 dynamical processes 51 Late Jurassic 51 SN #A 51 weakly interacting 51 hydrological cycle 51 springtime ozone 51 anthropogenic emissions 51 hominid evolution 51 lavas 51 glaciers melted 51 ferric oxides 51 WASP #b 51 eukaryotes 51 dinosaur extinction 51 hydrothermal activity 51 plankton blooms 51 hypoxic zones 51 warmings 51 plate tectonics 51 GJ #b [001] 51 ALH# 50 magmatism 50 biogenic 50 Fomalhaut b 50 lunar meteorites 50 Cretaceous Paleogene 50 methane CH4 50 sulfur isotope 50 Triassic Period 50 anammox 50 cratons 50 atmospheric CO2 levels 50 sulfate aerosol 50 evaporite deposits 50 sulfate aerosols 50 carbon isotopes 50 ultraluminous galaxy 50 isotope ratios 50 Pacific Decadal Oscillation 50 archaea 50 Hadean 50 Siberian Traps 50 magmas 50 lunar perigee 50 Sturtian 50 multicellular creatures 50 isotopic fractionation 50 sterile neutrino 50 rifting 50 magnetic reconnection 50 prebiotic molecules 50 Murchison meteorite 50 endosymbiosis 50 Mesozoic era 50 forams 50 terrestrial ecosystems 50 G#.# +#.# 50 lowermost mantle 50 Yellowstone caldera 50 anthropogenic CO2 50 Paleozoic Era 50 Tertiary Period 50 CO2 concentrations 50 Anthropocene 50 nucleobases 50 phytoplankton blooms 50 megathrust earthquake 49 Archaean 49 Cenozoic era 49 Bose Einstein condensation 49 hydroxyl radical 49 Earth biosphere 49 lipoprotein cholesterol 49 eukaryote 49 atmospheric CO2 49 Middle Miocene 49 subglacial lakes 49 Cretaceous Tertiary KT 49 Holocene epoch 49 nitrogen fixation 49 anthropogenic carbon dioxide 49 Quaternary 49 Holocene 49 Permo Triassic 49 Noachian era 49 explosive volcanism 49 dinitrogen 49 nuclides 49 megafauna 49 Prochlorococcus 49 isotopic compositions 49 Pleistocene 49 GRB # 49 gravitational radiation 49 inorganic mercury 49 sulfidic 49 Laurentide Ice Sheet 49 carbon cenospheres 49 silicate rocks 49 ULIRGs 49 single celled organisms 49 QQ# 49 Milankovitch 49 Late Pleistocene 49 isostatic rebound 49 Burgess Shale 49 methane hydrates 49 radiative forcing 49 glaciers receded 49 PER2 49 single celled 49 atmospheric carbon dioxide 49 oxygen isotope 49 substorms 49 Milankovitch cycles 49 Panderichthys 49 cyanobacteria 49 supervolcanoes 49 explosive eruptions 49 Toba eruption 49 lipofuscin 49 Cretaceous Tertiary boundary 49 YORP effect 49 foraminifera 48 isotopic ratios 48 Pleistocene Ice Age 48 Cretaceous Paleogene boundary 48 isotopic composition 48 γ 48 photosynthetic organisms 48 greenhouse warming 48 lunar magma 48 Mount Tambora 48 nitrification 48 abiogenic 48 fermion 48 subglacial 48 martian meteorites 48 atmospheric concentrations 48 chimps diverged 48 multicellular organisms 48 Mojzsis 48 supercontinent Pangea 48 lipid peroxides 48 anoxia 48 nitrous oxide N2O 48 anerobic 48 Proteobacteria 48 carbonate minerals 48 Trichodesmium 48 sedimentary deposits 48 WMAP satellite 48 Deccan volcanism 48 Keeling Curve 48 biogeochemical 48 photochemical reactions 48 BIFs 48 flood basalts 48 Gondwanaland 48 Gigantopithecus 48 geological timescale 48 olivine 48 glaciers retreated 48 fossilisation 48 Chicxulub 48 Tycho supernova 48 mid Pliocene 48 lunar crust 48 Kepler #b 48 southern supercontinent 48 Jupiter moon Io 48 pre biotic 48 punctuated equilibrium 48 carbonaceous chondrite 48 GRB# 48 metazoan 48 meteoritic material 48 Type Ia supernova 48 lung edema 48 Miocene Epoch 48 Proterozoic 48 Cretaceous periods 48 Sumatran earthquake 48 supernova explosions 48 phyllosilicates 48 methane clathrates 48 Climatic Optimum 48 Mesozoic Era 48 hydroxyl radicals 48 animal phyla 48 Maastrichtian 48 post perovskite 48 Gliese #g 47 gigatonnes 47 microcephalin 47 GJ#b 47 geochemists 47 sulfur isotopes 47 ramidus 47 collisional 47 supercontinents 47 interglacials 47 tetrapods evolved 47 atmospheric aerosols 47 Tharsis Rise 47 El Niño Southern Oscillation 47 Chicxulub impact 47 Ontario Lacus 47 Sr Ca 47 infall 47 abundances 47 metastable 47 Atlantic Multidecadal Oscillation 47 ° C warmer 47 polar vortex 47 dinoflagellates 47 neutrino mass 47 mid latitudes 47 methane clathrate 47 reionization epoch 47 fossilization 47 thermal inertia 47 Southern Oscillation 47 interannual 47 chondrules 47 phytoplankton biomass 47 inhomogeneities 47 humans Homo sapiens 47 Atlantic Multidecadal Oscillation AMO 47 gravitational microlensing 47 CAIs 47 insulin secreting cells 47 subsurface ocean 47 Pleistocene Epoch 47 protoplanetary disk 47 Martian meteorite 47 upwellings 47 vertebrate evolution 47 phytoplankton bloom 47 superheavy elements 47 placental mammals 47 cryovolcanism 47 single celled algae 47 Bose Einstein condensate 47 phenanthrene 47 goethite 47 midlatitudes 47 magnetar 47 Corot 9b 47 evolutionary lineage 47 orbital eccentricity 47 interconversion 47 komatiites 47 multi decadal 47 Oligocene 47 mantle convection 47 megathrust quakes 47 otoliths 47 Jakobshavn Isbrae 47 supernovae explosions 47 shear modulus 47 methane seeps 47 chondritic 47 terrestrial vertebrates 47 thermohaline circulation 47 glacial retreat 47 interstellar dust grains 47 anomalously warm 47 earliest tetrapods 47 phytoplankton 47 sedimentary rock 47 megadroughts 47 fissure eruption 47 cosmic ray flux 47 megaflood 47 faunas 47 planetary nebula 47 oxidized mercury 47 methane hydrate 47 runaway greenhouse 47 red supergiant 46 carboniferous 46 deformational 46 multi celled organisms 46 extinctions 46 Cenomanian 46 Late Miocene 46 anthropogenic CO2 emissions 46 Harmful algal blooms 46 Miller Urey experiment 46 Upper Palaeolithic 46 chlorine peroxide 46 starburst galaxies 46 hypernova 46 perturbation 46 exoplanetary systems 46 Paleocene Eocene 46 isoprene 46 superoxides 46 sunspot activity 46 sediments 46 matter antimatter asymmetry 46 Upper Paleolithic 46 teragrams 46 Pleistocene Age 46 Maunder minimum 46 magnetic polarity 46 anthropogenic CO 46 meteoroid 46 Coral bleaching 46 Cretaceous Tertiary 46 Chicxulub crater 46 equilibration 46 type Ia supernovae 46 carbonic acid 46 oxygen depletion 46 isotopic 46 dromaeosaurs 46 angiosperm 46 protoplanet 46 reactive nitrogen 46 unicellular organisms 46 strangelet 46 Laurentide ice sheet 46 asteroid impacts 46 speciation 46 photosynthetic bacteria 46 protoplanets 46 Eocene 46 methane oxidation 46 peridotite 46 desorption 46 Oort cloud 46 gamma ray burst 46 oxygen isotopes 46 continental crust 46 antineutrinos 46 Haber Bosch 46 geoneutrinos 46 electron neutrinos 46 Ardipithecus ramidus 46 Cretaceous 46 marine phytoplankton 46 Methyl mercury 46 evolutionary divergence 46 Rubisco 46 volcanic magma 46 Dry Valleys 46 clathrate 46 Puijila 46 megadrought 46 coevolution 46 photoemission 46 noctilucent clouds 46 silicate dust 46 deep convective clouds 46 subduction zones 46 anatomically modern 46 metazoans 46 dwarf galaxy 46 hypoxia 46 Lake Vostok 46 Woese 46 hydroxyl molecules 46 superoxide 46 exo planet 46 aeolian 46 radioactive decay 46 Antarctic Dry Valleys 46 axial tilt 46 phyllosilicate 46 megafauna extinction 46 supernovae 46 melt inclusions 46 prebiotic chemistry 46 tectonic stresses 46 Archaea 46 smallest exoplanet 46 crustal 46 X ray emission 46 dinoflagellate 46 interstellar clouds 46 chlorine monoxide 46 quark gluon plasma 46 trilobites 46 isotope composition 46 hydrothermal fluids 46 Medieval Warm Period 46 carbonaceous chondrites 46 archeopteryx 46 scientists theorize 46 lobe finned fishes 46 Triassic 46 tetrapods 46 dustier stormier atmosphere 46 peridotites 46 galactic mergers 46 poleward 46 DNA rearrangements 46 magnetic substorms 46 type Ia supernova 46 protists 46 supermassive stars 46 diatom 46 carbonate globules 46 planktonic foraminifera 46 chondrites 46 biodegraded 46 polaritons 46 eruptive activity 46 ozone O3 45 C4 grasses 45 volcanic tremor 45 Pliocene epoch 45 ancient supercontinent 45 Noachian period 45 methane 45 aerosol particles 45 Hawking radiation 45 distant supernovae 45 HAR1 45 Cryogenian period 45 Arctic oscillation 45 Ardipithecus 45 Chicxulub Crater 45 baryonic 45 Paleozoic era 45 primate evolution 45 nucleosynthesis 45 faunal 45 platinum Pt 45 epigenetic inheritance 45 mantle plumes 45 jarosite 45 Nature Geoscience 45 CaCO 3 45 anthropogenic warming 45 gravitational interactions 45 komatiitic 45 biodegradation 45 kerogen 45 noble gases 45 Pleistocene era 45 nucleation 45 hydrothermal 45 Middle Eocene 45 Cretaceous Tertiary extinction 45 Deccan Traps 45 adsorbed 45 subatomic particle 45 megathrust quake 45 eukaryotic cells 45 Homo sapiens 45 Tiktaalik 45 basalts 45 Gondwana supercontinent 45 Earth Overshoot Day 45 planetesimal 45 Maunder Minimum 45 australopithecines 45 Cyanobacteria 45 Corot 7b 45 sauropod dinosaurs 45 Shiveluch 45 brachiopods 45 Eta Carinae 45 Zeebe 45 supervolcano 45 Laurasia 45 sub glacial lakes 45 epochs 45 GRBs 45 hypoxic zone 45 Hominids 45 AB Aurigae 45 subatomic scale 45 glacier shrinkage 45 elliptical galaxy 45 chlorophyll concentrations 45 Nili Fossae 45 permafrost melts 45 sunspot cycle 45 rocky planets 45 glacial earthquakes 45 multicellularity 45 decoherence 45 Zalasiewicz 45 perihelion 45 SN Ia 45 Arctic Oscillation 45 vertebrate fossil 45 brightest supernova 45 Messinian 45 radioactive nuclei 45 Mass Extinction 45 tectonic activity 45 denitrification 45 energetic gamma rays 45 X ray binaries 45 Homo antecessor 45 Paleocene 45 Dr Glikson 45 hydrothermal vent 45 Bullet Cluster 45 Nankai Trough 45 glacial meltwater 45 oceanic circulation 45 nitrogenase 45 Volcanism 45 Paranthropus robustus 45 trimers 45 liquid ethane 45 hydrologic cycle 45 RS Ophiuchi 45 Late Cretaceous Period 45 placental mammal 45 Eocene Oligocene 45 ejecta 45 Denisovans 45 microbial organisms 45 weak gravitational lensing 45 Paranthropus 45 Gliese #c 45 atmospheric circulation 45 neutrino oscillation 45 Tunguska meteorite 45 acetylation 45 micelles 45 photosynthetic microbes 45 amphipods 45 evaporite 45 cosmic microwave background 45 Quaternary Period 45 dissolved inorganic 45 Late Paleozoic 45 spherules 45 angiosperms 45 upwelling 45 planemos 45 neutrino 45 Martian microbes 45 wavefunction 45 Anisotropy Probe 45 positronium 45 Mott insulator 45 continental rifting 45 bacterial decomposition 45 osmotic stress 45 microfossils 45 hydrothermal fluid 45 Indian Ocean Dipole 45 supernova SN 45 metalloproteins 45 ocean upwelling 45 bosonic 45 GeV 45 ocean acidity 45 quasar 44 galaxy formation 44 choanoflagellates 44 single celled microorganisms 44 sulphidic 44 millisecond pulsar 44 V# Mon 44 anthropogenically 44 GHG concentrations 44 quasiparticle 44 ncRNA 44 zircons 44 species extinctions 44 Upper Carboniferous 44 phlogiston 44 geologic 44 Gamma ray bursts 44 atmospheric oceanic 44 paleoclimatic 44 Cosmic Microwave Background CMB 44 moulins 44 Kangerdlugssuaq 44 mosasaurs 44 endothermic 44 SN #D 44 electron neutrino 44 ocean basins 44 gamma ray bursts GRBs 44 magma chamber 44 climatic variability 44 methyl chloroform 44 volcanically active 44 Lake Nyos 44 dolomites 44 single celled bacteria 44 CoRoT 7b 44 rotifer 44 Paleozoic 44 primordial soup 44 anorthosite 44 Venusian atmosphere 44 cometary material 44 proton proton collisions 44 anaerobic oxidation 44 martian atmosphere 44 cyclicity 44 mya 44 Henize #-# 44 gaseous planet 44 quantum oscillations 44 galactic alignment 44 tuffaceous rocks 44 microlensing 44 km3 44 coral calcification 44 reaction kinetics 44 Martian atmosphere 44 acidification 44 thermodynamic stability 44 sulfides 44 anamensis 44 thermosphere 44 chemically reactive 44 Arabia Terra 44 anaerobic decomposition 44 isotopic signature 44 depositional environment 44 sedimentary layers 44 lobe finned fish 44 H. sapiens 44 Meridiani 44 Hanny Voorwerp 44 asteroidal 44 urinary excretion 44 single celled microbes 44 lithosphere 44 cnidarians 44 permafrost thaw 44 geomagnetic substorms 44 dinosaur specimens 44 Amundsen Sea Embayment 44 gastric distension 44 supernova 44 COROT 7b 44 polar mesospheric clouds 44 gut microbes 44 Myr 44 megafaunal 44 seawater pH 44 conodonts 44 NASA Wilkinson Microwave 44 decaying detritus 44 Saturn rings 44 Magellanic Stream 44 sodium atoms 44 superfluids 44 Great Contraction 44 multidecadal 44 Early Cretaceous Period 44 mud volcanoes 44 paleoclimate 44 neurologic dysfunction 44 H. habilis 44 otolith 44 copepod 44 Beringia 44 Madden Julian Oscillation 44 microscopic single celled 44 planet HD #b 44 degrees Fahrenheit warmer 44 earliest hominid 44 J# +# [002] 44 FGF# 44 muon neutrinos 44 icy comets 44 comet nuclei 44 chimpanzees diverged 44 amorphous silica 44 hydrothermal vents 44 ENSO cycle 44 oligotrophic 44 runaway thermonuclear 44 Cretaceous extinction 44 spectroscopic analysis 44 CYP#A# gene 44 trillionths 44 neutron star 44 metamorphism 44 eukaryotic 44 merging galaxies 44 turbidites 44 Plate tectonics 44 gamma ray emission 44 chromosomal rearrangements 44 silicic 44 epigenetic changes 44 coelacanths 44 methane burps 44 continental drift 44 H#K# [001] 44 ectodermal 44 El Niños 44 supercontinent Pangaea 44 undersea volcanoes 44 Jupiter icy moons 44 unicellular 44 SN #cr 44 orogenic 44 PETM 44 pillow lava 44 proton proton 44 surface temperatures SSTs 44 histone methylation 44 protostar 44 organic molecules 44 Appy Sluijs 44 Ayles Ice Shelf 44 paleoecology 44 Mud volcanoes 44 Bose Einstein condensates 44 sulphate aerosols 44 underwater volcanoes 44 tholins 44 mammalian genomes 44 gigatons 44 Sulphide mineralization 44 helium atoms 44 impactors 44 evolutionary adaptation 44 volcanic aerosols 44 biosignatures 44 glacial melt 44 X ray pulses 43 pillow lavas 43 supervolcano eruption 43 subcellular compartments 43 nucleotide substitutions 43 archosaurs 43 paleomagnetic 43 aerosol concentrations 43 biogeochemical cycles 43 biomineralization 43 Tunguska explosion 43 olivines 43 helium isotope 43 laforin 43 proton decay 43 ichthyosaur 43 Mesozoic 43 hypervelocity stars 43 greenhouse gas concentrations 43 Sedimentary rocks 43 meteoroid impacts 43 oxidized LDL 43 Yellowstone supervolcano 43 airway remodeling 43 hominins 43 neighboring Andromeda galaxy 43 mammalian evolution 43 seismicity 43 carbonatites 43 platypus genome 43 microbialites 43 Wolf Rayet star 43 chromosomal aberrations 43 Osedax 43 photolysis 43 active volcanism 43 antihydrogen atoms 43 Sarahsaurus 43 bonebed 43 antiparticle 43 Neanderthals Homo neanderthalensis 43 supersaturation 43 primate lineage 43 Hydrogen sulphide 43 Gamma ray burst 43 Palaeozoic 43 fearsome Tyrannosaurus rex 43 nebular 43 chemical reactions 43 undiscovered particle 43 myoglobin 43 teleost fish 43 large oceanic plateaus 43 subduction zone earthquakes 43 abiotic 43 lunar highlands 43 Particle acceleration 43 bioaccumulation 43 Cosmic Microwave Background 43 H. erectus 43 autotrophic 43 microbial ecosystems 43 heliosheath 43 galaxy supermassive black 43 biogeochemical processes 43 hominid species 43 eutrophication 43 ultramafic rock 43 Aram Chaos 43 Fig. 1b 43 Siberian permafrost 43 elemental abundances 43 Carbon dioxide 43 acetyl CoA 43 chemisorption 43 Makovicky 43 Homo sapiens evolved 43 tectonic 43 benthic foraminifera 43 atmospheric CO2 concentrations 43 phytoplankton populations 43 therizinosaurs 43 olivine mineral 43 sedimentological 43 comb jelly 43 Carboniferous Period 43 Velicogna 43 T. hallae skeletons 43 moonlet 43 Middle Awash 43 galactic cannibalism 43 gastrulation 43 crystalline silicates 43 tau neutrinos 43 Fermi Paradox 43 reef habitats 43 planktonic 43 Dromomeron 43 helium nuclei 43 organometallic compounds 43 zinc ions 43 silicate minerals 43 Martian volcanoes 43 huxleyi 43 Mandushev 43 Brugada syndrome 43 Kuiper Belt object 43 Microcystis 43 iceberg calving 43 genus Australopithecus 43 Earth crust 43 Alfven waves 43 antineutrino 43 Symptom onset 43 volcanogenic massive sulfide VMS 43 carbonyl sulfide 43 Australopithecus 43 peroxynitrite 43 Rignot 43 ostracods 43 ornithischians 43 Interglacial 43 calcite 43 tectonically 43 warm interglacial periods 43 megafloods 43 HD #b [002] 43 vertebrate 43 reptile extinctions 43 cometary 43 isotopic variations 43 Jevrejeva 43 fluid shear 43 attosecond 43 #gy 43 super Earths 43 ZEBOV 43 polyphosphates 43 stratospheric ozone depletion 43 volcanic earthquakes 43 magnetic dipole 43 zooplankton species 43 permafrost degradation 43 Type Ia 43 silicon monoxide 43 planetary warming 43 exosphere 43 BP Piscium 43 Ocean acidification 43 volcanoclastic 43 particle collisions 43 chlorine atom 43 REE enriched