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Canon 7d firmware 2.05 review2/20/2023 Among rock‐forming minerals, quartz is most strongly piezo‐electric, but its effect is much reduced because quartz crystals are usually randomly oriented. Piezo‐electricity is the electric polarization produced in certain crystals and ceramics by the application of mechanical stress. Electromagnetic signals of earthquakes are mainly concerned with the short term prediction. Depending on the concerned time scales, prediction is usually classified as long term (∼ tens of years), intermediate term (∼ a few years), and short term (months to days) predictions. Occurrence time is the most difficult to predict. Place of epicenter, time of occurrence, and magnitude are the three main items of earthquake prediction.
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