I don't even know what Etna is. I really don't care. It's superstition, and it does not reflect knowledge of human nature, but sheer ignorance. Again, this also has to do with a corrupt way of looking at Real Presence, where human interpretation
degrades a Mystery, especially when superstition gets in the way.
People like this give the Church the reputation of being in the "dark ages." The Orthodox Church I know welcomes science -- because science reveals ever more God's glory.