The class is sculpting a statue of Captain Walker, their city's founder. Captain Walker left instructions on how he wanted this statue sculpted in the form of a poem. Ms. Frizzle's class interprets the meaning—he wants it sculpted without the use of hands—a little too literally. However, the statue breaks off the top of the mountain, and falls down. The Friz turns the bus into a rock and follows. Water erosion reduces the statue to a head by the time they reach the bottom. Desperate to get to the ceremony, the bus cracks open a dam of rocks that has formed and slides down the mountain. However, they found that somehow they made the mountain into a statue of Captain Walker's head and realize that Captain Walker had wanted his statue sculpted through erosion!