Ms. Frizzle and her pupils embark on a rock-collecting field-trip aboard the Magic School Bus that takes them to the very center of the earth as they search for sedimentary, metamorphic, and igneous rocks,On a special field trip in the magic school bus, Ms Frizzle's class learn at first hand about different kinds of rocks and the formation of the earth.Ms. Frizzle and her pupils embark on a rock-collecting field-trip aboard the Magic School Bus that takes them to the very center of the earth as they search for sedimentary, metamorphic, and igneous rocks,On a special field trip in the magic school bus, Ms Frizzle's class learn at first hand about different kinds of rocks and the formation of the earth.