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  • Title: The cave that holds clues to life on Mars.
    Author: Nelson P.
    Journal: Natl Widl; 1996; 34(5):36-42. PubMed ID: 11542304.
    Abstract:
    Deep in Lechuguilla Cave, a researcher ponders slots carved millions of years ago by dripping sulfuric acid. Though the cave was formed by acid bubbling up from below, here gases condensed on the chamber's ceiling and then rained down as acid. Scientists think Mars may also hold caves carved by sulfuric acid. On Earth, almost all other caves are formed by flowing water.
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