As was typical any time he asked about anything remotely related to magic, he got terms and words thrown his way he didn't understand, and had to politely ask the mare to explain things to him in 'lay terms'. One of these days, he was just going to grab Crimson, sit her down in a room with him, point at a magic book, and yell 'EDUCATE ME!'. Long story short, whatever effect magic had in this world didn't stop where the ground began. What was possible through immense geological formation over phenomenal scales of time was also possible through magical incubation in certain rock types.