(Estimating glacial ages) The following oxygen-18 data were obtained from soil samples taken at different depths in Ontario, Canada. Assuming that all the l8O was laid down during the last glacial age and that the transport of l8O to the surface takes place by molecular diffusion, estimate the number of years since the last glacial age from the following data. Independent measurements give the diffusivity of l8O in soil as 2.64 × 10-10 m2/s.
Figure 3 Glaciers.
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