Alessandro Da Mommio completed his PhD in geology at the University of Milan in 2015. With a long-standing expertise in petrography since his undergraduate studies, he has developed a distinguished website dedicated to his specialty: the petrography of minerals and rocks. In 2014, one of his images secured second place in the Nikon Small World Photomicrography Competition. He's currently teaching science and mathematics. Victoria Pease is Professor of Tectonics and Magmatism at Stockholm University. Her research focuses on Arctic tectonics. She has been teaching the next generation of geologists for more than 20 years. She sits on a number of international scientific committees and is Chief Editor of Precambrian Research. Victoria is co-author (with Hugh Rollinson) of the reference textbook Using Geochemical Data: To Understand Geological Processes, Second Edition (2021, Cambridge University Press).