Rock collecting has never been quite like this! When the class forgets to do its homework, a fieldtrip through the Earth's crust, into the center of the Earth,

The Magic School Bus carrying Ms. Frizzle and the entire class, shrinks and is accidentally eaten by Arnold, and journeys through his body.

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.

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.

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.