11. For example, the carbon isotopic composition of carbonatites is mantle-like and not like sedimentary limestone. 12. Variations in isotopic composition of extraterrestrial materials stem from planetary interplanetary dust particles and cometary volatiles. 13. By studying SEP's isotopic composition , scientists can indirectly measure the material that formed the solar system. 14. But, he added, " The question of carbon isotopic composition is something of a mystery ." 15. View of a slice of the Meteorite EETA 79001, showing dark glass inclusions containing distinct isotopic compositions . 16. According to the IsoRes hypothesis, there are certain resonance isotopic compositions at which terrestrial organisms thrive best. 17. The experiment was successful and provided accurate He, Ne and Ar isotopic compositions of the solar wind. 18. Also important are their extreme isotopic compositions , which are expected to exist nowhere in the interstellar medium. 19. The first measurements used spheres of silicon with natural isotopic composition , and had a relative uncertainty of 3.1. 20. Hydrogen Minerals generally have large isotope effects, and the isotopic composition often follows the pattern observed for precipitation.
