Related by context. Frequent words. (Click for all words.) 64 abundances 63 stable isotope 63 radiocarbon 61 spectroscopic 60 anisotropy 58 chemical composition 57 spectra 57 geochemical 56 radiometric 56 isotope 56 analyte 56 mtDNA 55 apatite 55 radioactive decay 54 fluxes 54 spectroscopy 54 redshift 54 radiocarbon dating 54 lake sediments 54 mineralogy 54 radionuclide 54 magmatic 53 olivine 53 deuterium 53 geologic 53 carbon isotope 53 rubidium 53 volcanism 52 aerosol particles 52 X ray diffraction 52 silicate 52 biogenic 52 cosmic microwave background 52 silicates 52 phylogenetic 52 radiative 52 nuclei 52 ejecta 52 morphological 52 geochemistry 51 magnetization 51 crustal 51 isotopes 51 chirality 51 mineralogical 51 basalts 51 spectral 51 Raman spectroscopy 51 diatom 51 hydroxyl 51 interferometry 51 FRET 51 carbonaceous 50 sediments 50 sediment cores 50 morphology 50 conductivity 50 measurements 50 iron oxides 50 copper Cu 50 calcite 50 atmospheric 50 geological 50 dynamical 50 conductance 50 nitrogen fixation 49 isotropic 49 X ray emission 49 anomalously 49 refractive index 49 surface roughness 49 adsorption 49 ^ sup 49 Ordovician 49 Quaternary 49 quasars 49 Geochemistry 49 chromatographic 49 mid latitudes 49 glaciation 49 interstellar medium 48 supernovae 48 Supplementary Fig 48 mass spectrometry 48 Pliocene 48 analytes 48 reflectance 48 genomic DNA 48 sedimentary 48 globular clusters 48 isomers 48 WMAP 48 Eocene 48 spectrometers 48 astronomical observations 48 XRD 48 iridium 48 supernova remnant 48 methylation 48 Holocene 48 electrical conductivity