Ever heard of rocks exploding in a campfire? Can it really happen, and how dangerous is it? What happens if you spill molten metal on concrete? Today we will look at how and why concrete and rocks spall during a fire. Instagram - https://www.instagram.com/backyardscientistlofficial/ Twitter - https://twitter.com/ChemicalKevy Facebook - https://www.facebook.com/TheBackyardScientistOfficial/