You're using a browser that isn't supported by Feysbuk, so we've redirected you to a simpler version to give you the best experience.Gezegenin çekirde?inde meydana gelen çembersel ak?mdan kaynaklan?r. Belirli kristaller, kuartzlar ve hatta ?eker de d?? yumrukya sunulan kald???nda, yüzleri ortada fark olu?turur. Piezoelektrik, 1880 senesinde Pier