Abstract
We have determined the individual densities of 72 small (diameters between 15 and 100 μ) spherules of three distinct types: (1) found in polar ice, (2) collected near known volcanoes, and (3) produced in the laboratory from meteoritic samples. The average densities of these three types of spherules are 4.54, 2.75, and 4.92 g/cm³, respectively, lending support to the claim that most polar spherules do not have a volcanic origin.
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