piercing points
... that piercing points are used by geologists to find out how much a fault has moved?
... that <b id="mwAUY"><a href="./Piercing_point" id="mwAUc" rel="mw:WikiLink" title="Piercing point">piercing points</a></b> are used by geologists to find out how much a <a href="./Fault_(geology)" id="mwAUg" rel="mw:WikiLink" title="Fault (geology)">fault</a> has moved?<!-- Was supposed to be in yesterday, but hook got lost somehow. :( Added it to this prep area -->