From moldavite to fulgurite, how is natural glass formed?

When we think of glass, many of us picture it as a man-made product that we use every day. But did you know that nature also has its own versions of glass? Indeed! Volcanoes, lightning, and even meteorites all play a role in forming natural glass. And believe it or not, even the very first atomic bomb once unintentionally produced glass. Curious about how that happens? Read on quickly!