| 11. | Anomalies in chromium isotopic ratios found within the K-T boundary layer strongly support the impact theory.
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| 12. | Comets and terrestrial water have similar isotopic ratios.
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| 13. | The isotopic ratio of 18 O to 16 O, usually in foram tests or ice cores.
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| 14. | Temperature, isotopic ratios, elemental ratios, mercury & CO2 concentrations are all data points under close examination.
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| 15. | The isotopic ratio is " the smoking gun " of the particles'deep-space, pre-solar system origins, he added.
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| 16. | It then goes on to define what water is using an isotopic ratio stated in a molar fraction.
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| 17. | The isotopic clock resets may result from thermal effects changing isotopic ratios, and changes to cosmic radiation exposure.
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| 18. | Therefore, precise analysis of Pb isotopic ratios can be used to study the circulation of the different oceans.
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| 19. | Oxygen isotopic ratios, which may be measured very precisely, yield a unique and distinct signature for each solar system body.
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| 20. | The D / H isotopic ratio is a primary constraint on the source of H 2 O of terrestrial planets.
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