Synopsis

Deeper and deeper they burrowed, until the drill bit on the Drill Engine Train shattered. The Pteranodon Family found themselves in a cavern filled with colossal crystals, where they embarked on a comprehensive study of rocks and minerals—their nature, their distinctions, and their origins. To return home, the family had to repair the broken bit by discovering a mineral exceeding the hardness of the one that had failed. This story aims to illustrate that minerals arise naturally within the E