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Science 8 October 1976:
Vol. 194. no. 4261, p. 190
DOI: 10.1126/science.8842
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Articles

Science, Vol 194, Issue 4261, 190-190
Copyright © 1976 by American Association for the Advancement of Science

articles

Volcanic Ash: Terrestrial versus Extraterrestrial

John A. O'Keffe

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.


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