Related by context. Frequent words. (Click for all words.) 58 meteorite 55 sedimentary rock 54 meteor 54 lunar soil 53 ejecta 53 continental crust 53 meteoroid 53 volcanic rock 53 stromatolites 53 salt crystals 53 Chicxulub 52 basaltic 52 meteorites 52 plesiosaur 51 basalt 51 solar nebula 51 lithosphere 50 lavas 50 olivine 50 isotopic composition 50 supernova explosion 50 comet 49 subatomic particle 49 martian 49 asteroid 49 foraminifera 49 fragments 49 lava tubes 49 rocky planets 48 supernova explosions 48 Meridiani 48 meteoroids 48 regolith 48 spherules 48 oceanic crust 48 hydrothermal vent 48 planetoid 48 calcite 47 Kuiper belt 47 Haumea 47 comets 47 silicates 47 outer crust 47 reddish color 47 microbe 47 comet tail 47 Earth crust 47 lava flows 47 stalactite 47 molten rock 47 magnetar 47 pumice 47 fossilized 46 supercontinent 46 lava 46 quark gluon plasma 46 kerogen 46 zircons 46 Titan Saturn 46 Jupiter moons 46 fossils 46 craters 46 ionized gas 46 primordial soup 46 carbonic acid 46 Arctic permafrost 46 osmium 46 Galaxy Evolution 46 apatite 46 comet dust 46 earth crust 46 planetary nebula 46 volcanism 46 fossil 45 hadrosaur 45 single celled 45 fossilized remains 45 diatoms 45 crater 45 Poinar 45 volcanically active 45 rocks 45 Saturn rings 45 calcareous 45 feathered dinosaurs 45 single celled organisms 45 petrified wood 45 Saturn moon Enceladus 45 mudstone 45 volcanoes 45 comet nucleus 45 Iapetus 45 basalts 45 volcanic 45 Meteorites 45 carbonaceous 45 asteroids 45 X ray emission 45 magma chamber 45 greenish brown 45 igneous