Related by context. Frequent words. (Click for all words.) 68 isotopic 63 marine sediments 63 isotopic composition 62 oxygen isotopes 61 osmium 61 zircons 60 aerosol particles 59 lavas 59 electron density 59 infrared spectroscopy 58 igneous 58 olivine 58 crustal 58 microlensing 58 ejecta 58 spectroscopic 57 abundances 57 muon 57 solar nebula 57 iron oxides 56 lithosphere 56 mineralogical 56 lake sediments 56 anisotropy 56 volcanism 56 hydrothermal activity 56 magnetic reconnection 56 microfossils 56 silicates 56 magmatic 55 basaltic 55 atmospheric methane 55 continental crust 55 X ray emission 55 atmospheric CO 55 chemical composition 55 spherules 55 foraminifera 54 Antarctic ozone 54 biomolecule 54 stratospheric ozone 54 neutrino 54 sediments 54 basalts 54 spectral signature 54 Eta Carinae 54 carbonaceous 54 stable isotope 54 radioactive decay 54 otoliths 54 spectra 54 diatom 54 igneous rock 54 magnetization 53 planetary nebulae 53 galaxy formation 53 oceanic crust 53 paleoclimate 53 lunar soil 53 gravitational wave 53 magnetar 53 chirality 53 cometary 53 calcite 53 supernova explosions 53 ionospheric 53 radiocarbon 53 monazite 53 photometer 53 meteoroid 53 Hawking radiation 53 sediment cores 52 hydrogen ions 52 atmospheric 52 atmospheric circulation 52 mineralogy 52 desorption 52 radial velocity 52 morphologies 52 geochemical 52 oxygen atom 52 mass spectroscopy 52 iridium 52 astrophysical 52 cuprates 52 nuclei 52 explosive eruptions 52 redshifts 52 cosmic ray 52 supernova explosion 52 nacre 52 polycyclic aromatic hydrocarbons PAHs 52 supernova remnant 52 Hubble observations 51 auroral 51 graphitic 51 cosmic microwave background 51 analyte 51 X ray fluorescence 51 earth crust 51 dynamical