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"Subduction leads to Orogeny"

I saw a sticker expressing this phrase on one of the doors of the ES (Earth Sciences) building at the infamous Palomar College today. Because I had absolutely no idea what it meant, I decided to write it down and make an attempt to elucidate the mystery as soon as I got home. Imagine my disappointment when I found out that the phrase in question had no sexual connotations whatsoever...at least in the literal sense.