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(Click for frequent words.) 72 supercontinent 69 supercontinent Pangaea 67 Gondwanaland 67 Laurasia 66 supercontinent Gondwana 66 landmasses 63 ancient supercontinent 63 protoplanets 63 Gondwana supercontinent 62 supercontinent Pangea 61 lithosphere 61 planetesimals 61 lunar crust 60 southern supercontinent 60 flood basalts 59 Laurentide ice sheet 59 sedimentary layers 59 Permian Period 59 Martian craters 59 moonlets 59 galactic clusters 59 Plate tectonics 58 chondrules 58 mantle plumes 58 galactic disk 58 lithospheric 58 tectonically 58 basaltic rocks 58 moonlet 58 magma ocean 57 cratons 57 Gondwanan 57 ferric oxides 57 collisional 57 neutralinos 57 dromaeosaurs 57 Io volcanoes 57 phyllosilicates 57 circumstellar disks 57 calderas 57 filamentary 57 comet nuclei 57 Neutron stars 56 asthenosphere 56 continental crust 56 globulars 56 KBOs 56 protoplanetary disk 56 faunas 56 Kuiper belt objects 56 planetary orbits 56 inner moons 56 rifting 56 dense clumps 56 Paleozoic Era 56 magnetic monopoles 56 grabens 56 subglacial lakes 56 lobe finned fishes 56 forams 55 ornithischians 55 plate tectonics 55 Jurassic Period 55 circumstellar disk 55 planets moons 55 planets orbits 55 Cretaceous Paleogene boundary 55 silicate dust 55 paleomagnetic 55 interstellar dust grains 55 glaciers retreated 55 ocean ridges 55 multi celled 55 igneous rocks 55 elliptical galaxy 55 nucleons 55 quasicrystal 55 GJ#b 55 solar nebula 55 abiogenesis 55 evolutionary lineage 55 Toba eruption 55 sediments deposited 55 herbivorous dinosaurs 55 multicellular animals 55 crustal plates 55 blackholes 55 prokaryotes 55 single celled organisms 55 lowermost mantle 54 Kuiper belt 54 meteor impacts 54 glaciations 54 jovian 54 planetary nebulae 54 sedimentary deposits 54 merging galaxies 54 circumstellar 54 magnetized plasma 54 gravitational interactions 54 Homo neanderthalensis 54 galactic cores 54 polypeptide chain 54 interstellar cloud 54 fearsome Tyrannosaurus rex 54 continental drift 54 icy comets 54 molten magma 54 sauropod dinosaurs 54 coccolithophores 54 Paleocene Eocene Thermal Maximum 54 crinoids 54 conodonts 54 chondrites 54 glaciers receded 54 lunar meteorites 54 calcite crystals 54 planet WASP #b 54 nucleobases 54 humans Homo sapiens 54 Oort cloud 54 primitive organisms 54 mantle lithosphere 54 supervolcanoes 54 protoplanet 54 cosmic strings 54 Henize #-# 54 planemos 54 circular orbits 54 volcanic plumes 54 tidally 54 genetic lineages 53 tectonic plate movements 53 tectonic movements 53 olivine crystals 53 Wolf Rayet stars 53 KT boundary 53 silicate minerals 53 quantum particles 53 nebular 53 oceanic plates 53 magnetite crystals 53 Neogene 53 antimatter particles 53 proto galaxies 53 moon Mab 53 crustal plate 53 phyllosilicate 53 planetary embryos 53 oceanic crust 53 polar icecap 53 interstellar clouds 53 backboned animals 53 dynamical evolution 53 Antarctic glacier 53 speleothems 53 dwarf galaxy 53 ocean basins 53 sterile neutrino 53 ejecta blanket 53 Antennae Galaxies 53 Earth crust 53 organism genome 53 Gravitational waves 53 earliest tetrapods 53 moons orbiting 53 Martian meteorites 53 supersymmetric particles 53 Devonian Period 53 galactic halo 53 spheroidal 53 phylogenies 53 gravitationally bound 53 proto planetary disk 53 sea scorpions 53 impactors 53 Neanderthals Homo neanderthalensis 53 Saturn rings 53 supernova explosion 53 placental mammals 53 mineral olivine 53 Paleozoic era 53 ape ancestors 53 protostars 53 tholins 53 SMBH 53 polar vortex 53 volcanic magma 53 subducted 53 ionized hydrogen 52 silicon atoms 52 sub glacial lakes 52 prebiotic soup 52 Murchison meteorite 52 eukaryote 52 Gondwana 52 Oort Cloud 52 SN#A 52 Chicxulub impact 52 soliton 52 exoplanetary 52 single celled microbes 52 cometary impacts 52 millisecond pulsars 52 elliptical orbits 52 multicellular 52 lunar soil 52 Woolly mammoths 52 Homo species 52 tetrapods 52 Cretaceous Paleogene 52 microbial ecosystems 52 colliding tectonic plates 52 spacetime 52 tectonic stresses 52 large oceanic plateaus 52 craton 52 seafloor sediments 52 megadroughts 52 Eemian 52 starburst galaxy 52 TrES 4 52 megafauna 52 globular clusters 52 meteorite bombardment 52 zircons 52 oceanic lithosphere 52 luminous galaxies 52 Pleistocene Epoch 52 calcite 52 Etruscan civilization 52 stromatolites 52 exosphere 52 poly dA 52 Valles Marineris 52 filamentary structure 52 Pleistocene Age 52 Sagittarius dwarf galaxy 52 SN #A 52 lavas 52 Cambrian Period 52 moon Mimas 52 orbits Saturn 52 megafloods 52 planetesimal 52 brachiopods 52 carbonate minerals 52 prebiotic molecules 52 ancestor Homo erectus 52 Fomalhaut b 52 Globular clusters 52 type Ia supernova 52 shifting tectonic plates 52 cobalt atoms 52 fractal pattern 52 ancient lava flows 52 Tertiary Period 52 primate lineage 52 extinct mammals 52 megaflood 52 yardangs 52 subduction zones 52 icy moons 52 massifs 52 australopithecines 52 magmas 52 Tianyulong 52 blue supergiant 52 Laurentide Ice Sheet 52 crystal lattices 52 aragonite 52 Chicxulub crater 52 geological epoch 52 periodicities 52 asteroidal 52 tetrahedra 52 turbidites 52 prokaryote 52 supercolony 52 stony meteorites 52 animal phyla 52 Larsen Ice Shelf 52 elongated orbits 52 basalt columns 52 stellar nurseries 52 Triassic Period 52 Younger Dryas 51 silicate rocks 51 supernovae explosions 51 Nectocaris 51 anticlines 51 Milankovitch 51 Hyades cluster 51 optical lattice 51 Noachian 51 macroscopic objects 51 seafloor sediment 51 metamaterial structures 51 Kuiper Belt object 51 Borromean rings 51 glaciers melted 51 landforms 51 reionization 51 Upper Triassic 51 antineutrinos 51 AB Aurigae 51 magnetars 51 infall 51 ostracods 51 lightwaves 51 Syrtis Major 51 brightest supernova 51 vesper bats 51 Bullet Cluster 51 spiral galaxies 51 VY Canis Majoris 51 earth crust 51 Cosmic Microwave Background 51 Upsilon Andromedae 51 subducting plate 51 Higgs bosons 51 red supergiant 51 weakly interacting 51 heavily cratered 51 homo erectus 51 retrograde orbit 51 proplyds 51 accretion disks 51 planetary nebula 51 sunlike stars 51 H. habilis 51 gyres 51 latitudinal 51 isotope composition 51 Baptistina 51 crustal 51 Chazy Reef 51 coral skeletons 51 sulfur isotope 51 mantle convection 51 pyroclastics 51 Earthlike planets 51 basalt lava 51 branes 51 electrons behave 51 deep convective clouds 51 superheavy elements 51 Hot Jupiters 51 sterile neutrinos 51 stromatolite 51 subsurface ocean 51 morphological evolution 51 galaxies collide 51 salt crystals 51 horned dinosaurs 51 bird Archaeopteryx 51 trilobites 51 clathrates 51 multicellular organisms 51 infinities 51 Ordovician extinction 51 planet Nibiru 51 carbonaceous chondrite 51 quasiparticles 51 spicule 51 HM Cancri 51 Arabia Terra 51 biogeographic 51 epochs 51 galaxy clusters 51 rotational axis 51 NASA Voyager spacecraft 51 terranes 51 flatfishes 51 hematite mineral 51 ignimbrite 51 magnons 51 dirty snowballs 51 zircon crystals 51 Cenozoic Era 51 crustal rocks 51 silicate mantle 51 colliders 51 carbonate globules 51 Methone 51 Deccan Traps 51 olivine 51 gaseous planet 51 amorphous calcium carbonate 51 binary asteroid 51 mya 51 Laramidia 51 Tectonic plates 51 polygon shaped 51 Comet Halley 51 Galilean satellites 51 bonebed 51 spherically symmetric 51 metazoan 51 dinosaur extinction 51 neighboring Andromeda galaxy 51 Scientists theorize 51 Whillans Ice Stream 51 lobe finned fish 51 WASP #b 50 hypervelocity stars 50 capillary sequencing 50 nuclei 50 interglacial period 50 crystalline silicates 50 pillow lavas 50 foraminifera 50 Toutatis 50 baryons 50 radioactive nuclei 50 magnetar 50 millisecond pulsar 50 tectonic plate boundaries 50 seafloors 50 Fornax cluster 50 Cambrian Explosion 50 dwarf galaxies 50 tyrannosaurids 50 galactic magnetic 50 antiferromagnets 50 midlatitude 50 crystallites 50 Eocene epoch 50 red supergiants 50 periodic oscillations 50 protoplanetary disks 50 Lake Vostok 50 cinder cones 50 supernova explosions 50 Bose Einstein condensates 50 gravitational lenses 50 blue straggler 50 vortices 50 Early Cretaceous 50 galaxy formation 50 quartz grains 50 interglacial periods 50 Beringia 50 earths 50 filaments 50 branching corals 50 hominid ancestors 50 sulfur atom 50 abyssal plain 50 Eurasian landmass 50 Cretaceous sediments 50 hexagonal mirrors 50 neutron stars 50 RS Ophiuchi 50 sedimentary formations 50 YORP effect 50 rocky planets 50 tetrapods evolved 50 basalt rocks 50 molten droplets 50 poleward 50 AGNs 50 spinels 50 tectonic boundary 50 V# Mon 50 isostatic rebound 50 hydrogen isotopes 50 Precambrian 50 Panderichthys 50 unicellular organisms 50 warmings 50 magma chambers 50 macroscopically 50 polygonal shapes 50 lava tubes 50 biomineralization 50 dwarf spheroidal galaxies 50 Reiner Gamma 50 Cryogenian 50 felsic tuff 50 Olmecs 50 lunar magma 50 Crab pulsar 50 carbonate sediments 50 Tunguska meteorite 50 sedimentary rock 50 smectite 50 astrophysical objects 50 graphene sheets 50 celled organisms 50 Ares Vallis 50 martian rocks 50 undersea volcanoes 50 Phanerozoic 50 planetoids 50 mica schist 50 tectonic faults 50 Maunder minimum 50 granitic rock 50 unicellular 50 multicellular creatures 50 placental mammal 50 Late Cretaceous Period 50 bryozoans 50 Coma Cluster 50 hominid species 50 spicules 50 lunar craters 50 photosynthetic organisms 50 P/# A2 50 Gigantopithecus 50 Amundsen Sea 50 Antarctic glaciers 50 meteoroid impacts 50 mammalian genomes 50 angiosperms 50 Permian extinction 50 Ayles Ice Shelf 50 Neoproterozoic 50 protoplanetary discs 50 volcanism 50 andesitic rocks 50 paleoclimate 50 substorm 50 interstellar grains 50 interstellar dust clouds 50 quantum particle 50 Pleistocene Ice Age 50 colloidal crystals 50 crystalline solids 50 graphite whiskers 50 advection 50 Navajo sandstone 50 geological timescale 50 moulins 50 Computer simulations 50 Saturnian moons 50 basaltic lava 50 constellation Cassiopeia 50 carbon cenospheres 50 shadowed craters 50 accretion disk 50 Middle Paleolithic 50 planets 50 tidal tails 50 outermost planets 49 magma chamber 49 asteroid impacts 49 protostar 49 Milky Way halo 49 comets orbiting 49 supermassive 49 Archaea 49 Ross Ice Shelf 49 Trojan asteroids 49 terrestrial planets 49 post perovskite 49 polar latitudes 49 magnetic polarity 49 Cretaceous Period 49 SMBHs 49 claystone 49 metazoans 49 granitoids 49 Wolf Rayet star 49 Planetary nebulae 49 habilis 49 Antarctic continent 49 steppe mammoth 49 single celled algae 49 wavefunction 49 Hesperian epoch 49 sulfidic 49 zodiac constellations 49 crossbar latches 49 supermassive stars 49 proto planetary disks 49 giant elliptical galaxies 49 Siberian Traps 49 Fram Strait 49 Linhenykus 49 radiometric dating 49 feathered dinosaurs 49 trimers 49 trabeculae 49 volcanic lava flows 49 layered ultramafic 49 evolutionary lineages 49 evaporite minerals 49 mica sheets 49 called lobate scarps 49 Martian crater 49 Kuiper Belt Objects 49 spherules 49 chondritic meteorites 49 organic molecules 49 extrasolar 49 cometary material 49 galaxies 49 ULIRGs 49 solitons 49 glacial cycles 49 basalt volcanic 49 topological defects 49 multi celled organisms 49 hydrothermal fluids 49 termite mounds 49 lensing galaxy 49 microlensing events 49 Gerard Kuiper 49 singularities 49 gravitational interaction 49 interplanetary dust 49 Mesozoic era 49 permanently shadowed craters 49 dwarf hippos 49 Chicxulub 49 magmatism 49 observable universe 49 anorthosite 49 thrust faulting 49 geostationary orbits 49 diatoms 49 strange quark 49 elliptical galaxies 49 polar caps 49 hydrated silica 49 zodiacal light 49 filamentary structures 49 cosmic phenomena 49 symmetries 49 polar craters 49 electron spins 49 interacting galaxies 49 galaxy NGC 49 NASA QuikScat satellite 49 Triangulum 49 Virgo Cluster 49 phylogenetically 49 excitons 49 X ray binaries 49 Late Heavy Bombardment 49 photosynthetic microbes 49 tonalite 49 Corot 7b 49 torus 49 icosahedral 49 Earth tectonic plates 49 microscopic crystals 49 silicate mineral 49 basaltic rock 49 WMAP satellite 49 volcanic islands 49 celestial sphere 49 H. sapiens 49 Krakatoa eruption 49 ellipsoids 49 ejecta 49 hydrosphere 49 methane clathrates 49 fractal patterns 49 quasicrystalline 49 neutrino telescope 49 planet Uranus 49 active galactic nucleus 49 planet orbits 49 pillow lava 49 supervolcano 49 mitochondrial genomes 49 refugia 49 predatory dinosaurs 49 rotating neutron stars 49 galactic alignment 49 spherical halo 49 spherical particles 49 ionized gases 49 Trifid Nebula 49 microfossils 49 Petermann Glacier 49 Elliptical galaxies 49 basaltic magma 49 Andromeda galaxy 49 ancient hominid 49 superstrings 49 concretions 49 primitive meteorites 49 strangelets 49 Homo sapiens 49 exo planet 49 theropod dinosaur 49 Cambrian explosion 49 placoderms 49 planetoid 49 Homo sapiens evolved 49 Last Glacial Maximum 49 mammalian evolution 49 BIFs 49 epicycles 49 planets Uranus 49 Homo ergaster 49 Milankovitch cycles 49 volcanic caldera 49 tectonic rift 49 Navier Stokes equations 49 subaqueous 49 gravitational microlensing 49 interglacial 49 horned dinosaur 49 GJ #b [001] 49 fissions 49 Homo sapiens sapiens 49 intraplate 49 hadrosaurs 49 sunlike star 49 spinning neutron stars 49 carboniferous 49 colliding galaxies 49 X ray binary 49 neutrino detectors 49 silicic 49 Siberian permafrost 49 Agulhas Current 49 mammalian lineage 49 sauropodomorphs 49 Maxwell equations 49 glacial meltwater 49 Weddell Sea 49 axial tilt 49 binary asteroids 49 accretionary 49 Ediacara organisms 49 chalcogenides 49 cobalt atom 48 mammoth tusks 48 photon pairs 48 subglacial lake 48 iceberg calving 48 ALH# 48 asteroids orbiting 48 noctilucent clouds 48 H. erectus 48 geoid 48 quark gluon plasma 48 nebulosity 48 earliest hominid 48 hot Jupiters 48 protists 48 active galactic nuclei 48 Spitzer infrared spectrograph 48 GJ #b [002] 48 sulfur atoms 48 Galilean moons 48 vertebrate genomes 48 stony meteorite 48 iridium layer 48 oxygen isotopes 48 interstellar particles 48 Veil Nebula 48 deglaciation 48 geophysically 48 globular proteins 48 Einstein relativity theory 48 nomadic hunter gatherers 48 fossilisation 48 eccentric orbits 48 Saturn outermost ring 48 amphibolites 48 isotopic compositions 48 fossilized skeletons 48 hominoids 48 centralized mainframes 48 meteorite impacts 48 quasars 48 inner asteroid belt 48 continental rifting 48 eclogite 48 constellation Centaurus 48 dinosaur species 48 osmium 48 C4 grasses 48 reflection nebula 48 mosasaurs 48 Ediacaran Period 48 constellation Virgo 48 Ice Age glaciers 48 topologically 48 distant quasars 48 amphibolite 48 ultracold atoms 48 planet Gliese #c 48 circular depressions 48 polymer nanofibers 48 igneous rock 48 uraninite 48 superfluid 48 Mott insulator 48 Higgs particle 48 microscopic specks 48 J# +# [002] 48 moon Phobos 48 snail shells 48 solidified lava 48 Homo antecessor 48 concentric rings 48 trilobite 48 equilateral triangles 48 volcanic tuff 48 tiny single celled 48 Hadean 48 planet HD #b 48 Sinus Meridiani 48 geological strata 48 volcanic basalt 48 Omega Centauri 48 galaxy cluster 48 Charcot Island 48 collagen fibrils 48 silicon monoxide 48 Josephson junctions 48 Paranthropus 48 missing baryons 48 Noachian era 48 spacecraft flyby 48 Cenozoic era 48 Quaternary Period 48 Maiacetus 48 diatremes 48 fossilized footprints 48 muon neutrino 48 planet magnetosphere 48 Jupiter magnetosphere 48 manganese atoms 48 Late Cretaceous 48 overlying layers 48 electrons orbiting 48 meteorite fragments 48 chromosphere 48 microbial organisms 48 graphene sheet 48 paragneiss 48 Voyager spacecraft 48 SUSY 48 hollow cylindrical 48 Anomalocaris 48 Late Devonian 48 icesheet 48 supergiant stars 48 yeast genome 48 Late Jurassic 48 TNOs 48 Theropods 48 glass prisms 48 amphibolite facies 48 floresiensis 48 isotopic composition 48 Tauri Sb 48 southern latitudes 48 atomic nuclei 48 Anthropocene 48 volcano sedimentary sequences 48 sulfide deposits 48 McMurdo Dry Valleys 48 Epsilon Eridani 48 Homo erectus evolved 48 euchromatin 48 galactic mergers 48 Fossae 48 relativistic particles 48 pegmatite dyke 48 Ediacaran 48 interstellar dust particles 48 Bose Einstein Condensate 48 astronomer Ptolemy 48 refugium 48 Tharsis Rise 48 Late Triassic 48 constellation Coma Berenices 48 atoms 48 toroid 48 proto cluster 48 Galileo spacecraft 48 glaciation 48 lineages 48 ramidus 48 hydrothermal vent 48 Stegodon 48 Holocene epoch 48 cosmological theories 48 polaritons 48 NGC# 48 Martian crust 48 meridional flow 48 dynamical 48 subduction 48 supernova remnants 48 dolomites 48 Prototaxites 48 mineralized mafic 48 lava domes 48 therizinosaurs 48 discontinuously 48 Saturnian moon 48 Cretaceous Tertiary KT 48 Quaoar 48 magnetosphere 48 halite 48 BP Psc 48 microbialites 48 photosphere 48 Earthlike 48 ignimbrites 48 potassium atoms 48 nanobubbles 48 Big Bang Machine 48 Wilkins Ice Shelf 48 khipu 48 DNA helix 48 anatomically modern 48 magnetic reconnection 48 Martian volcanoes 48 Bose Einstein condensate 48 Kuiper Belt objects 48 choanoflagellates 48 detect gravitational waves 48 sediments 48 Caloris 48 Sauropods 48 constellation Ophiuchus 48 Kermadec Arc 48 sulfate aerosols 48 superorganism 48 intermolecular forces 48 antiprotons 48 altered ultramafic rocks 48 helium atom 48 wave particle duality 48 recrystallized 48 volcanic aerosols 48 intracluster 48 sedimentary strata 48 polystyrene spheres 48 bony armor 48 constellation Hercules 48 cnidarians 48 morphologies 48 intrinsic brightness 48 dipolar 47 Saturnian 47 komatiite 47 silicate crystals 47 morphologically 47 photonic crystal 47 HARPS instrument 47 Voyager probes 47 prehistoric mammals 47 theropod dinosaurs 47 Arsia Mons 47 Tibetan Plateau 47 SN #gy 47 KT extinction 47 volcanoclastic 47 lunar highlands 47 birdlike dinosaur 47 Zalasiewicz 47 komatiitic 47 cosmic ray collisions 47 galaxy M# [001] 47 mitochondrial Eve 47 quantum superposition 47 neutrino mass 47 spatial scales 47 Orion nebula 47 bilaterally symmetrical 47 neutron star 47 presolar grains 47 Meteorites 47 Great Oxidation Event 47 moon Ganymede 47 comets 47 microcrystals 47 clastic 47 spherically 47 biogeographical 47 comb jelly 47 spiral nebulae 47 loess 47 sedimentary sequence 47 Mesozoic mammals 47 mammalian ancestor 47 earths crust 47 braincase 47 unicellular algae 47 GRBs 47 carbonatites 47 placentals 47 Theorists 47 isotopic signature 47 Nazca civilization 47 downwelling