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← ScienceWhich outcome occurs when the ratio of isotopes in groundwater changes?
A)Dating accuracy of water decreases✓
B)Radioactive contamination hazard increases
C)Geochemical tracer reliability increases
D)Hydrologic residence time gets shorter
💡 Explanation
Groundwater isotope ratios are used in hydrological dating; isotopic fractionation causes 'isotope clocks' to reset because radioactive decay changes the observed ratios. Therefore, age estimate accuracy decreases rather than measuring other effects, because relative shifts in the ratio are key.
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