SALMON, Idaho (Reuters) – Underground quartz deposits worldwide may be behind earthquakes, mountain building and other continental tectonics, a discovery that may aid in predicting tremblers, according to a study released on Wednesday. The findings by Utah State University geophysicist Anthony Lowry and a colleague at the University of London, to be published Thursday in the journal Nature, may solve a riddle of the ages about the formation and location of earthquake faults, mountains, valleys and plains. "Certainly the question of why mountains occur where they do has been around since the dawn of time," Lowry told Reuters. He and...