Volcanic Ash: Terrestrial Versus Extraterrestrial

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Science  08 Oct 1976:
Vol. 194, Issue 4261, pp. 190
DOI: 10.1126/science.8842


A principal difference between terrestrial and extraterrestrial lavas may consist in the greater ability of terrestrial lavas to,form thin films (like those of soap bubbles) and hence foams. It would follow that, in place of the pumice and spiny shards found in terrestrial volcanic ash, an extraterrestrial ash should contain minute spherules. This hypothesis may help to explain lunar microspherules.