Related by context. Frequent words. (Click for all words.) 66 isotopic 61 abundances 61 aerosol particles 60 marine sediments 59 zircons 59 microfossils 58 stable isotope 57 lavas 57 chemical composition 56 sediment cores 56 lake sediments 56 diatoms 56 organic molecules 56 radiocarbon 55 olivine 55 hydroxyl 55 carbon isotope 55 morphologies 55 nuclei 54 melanosomes 54 terrestrial ecosystems 54 zeolites 54 biogenic 53 silicates 53 mid latitudes 53 deuterium 53 sediments 53 water vapor 52 diatom 52 SWNTs 52 ejecta 52 Computer simulations 52 oxygen atoms 52 elliptical galaxies 52 atmospheric circulation 52 chirality 52 spectroscopic 52 supernova explosions 51 oxygen atom 51 basaltic 51 iron oxides 51 hydrogen ions 51 calcite 51 atmospheric CO 50 lithosphere 50 continental crust 50 hydrogen atoms 50 basalts 50 spectrometry 50 nitrogen fixation 50 cosmic microwave background 50 organic compounds 50 carbon atom 50 albedo 50 numerical simulations 50 particle sizes 50 X ray emission 50 Meridiani 49 Ardipithecus 49 crystalline structure 49 atmospheric chemistry 49 microstructures 49 sulphates 49 atmospheric carbon dioxide 49 dynamical 49 radiative 49 mitochondrial genome 49 quark gluon plasma 49 landforms 49 radiocarbon dating 49 terrestrial planets 49 HD #b [002] 49 igneous 49 volcanism 49 anisotropy 49 amino acids 49 geomorphology 48 atoms 48 morphology 48 archaea 48 rocky planets 48 radioactive decay 48 radiative forcing 48 neutrino 48 atomic nuclei 48 morphological 48 equatorial regions 48 aerosols 48 carbon atoms 48 phenolic compounds 48 supernova remnant 48 interglacial period 48 astrobiologists 48 super Earths 48 single celled organisms 48 photosynthesis 48 polar caps 48 nanodiamonds 48 geochemistry 48 oceanic crust 48 mass spectroscopy