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avalyslast Sunday at 2:07 AM1 replyview on HN

Volcanic ash is particularly bad because it is so abrasive, having been freshly formed without any opportunity for erosion to smooth it down like regular dust.


Replies

duskwufflast Sunday at 4:39 AM

That's not the only problem - volcanic ash also has a low enough melting point that it'll melt in the combustion chamber of a jet engine and leave glassy deposits on cooler components.