peregrine77 wrote:Hello Charles, I believe you may be referring to the Piezoelectric Effect. This occurs when a mechanical force is applied to certain crystals which in turn produce voltage. For many years this reaction was thought to be UFO's, ooops, ovni's in the mountains of Arizona. If I may guess what the force required may be, I have postulated it could simply be rocks moving against each other during temperature differential much the way it can make rocks crack. Tectonic activity could certainly generate the force required and no doubt other factors I know nothing about.
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