The class ends up inside a cake they try to bake for Ms. Frizzle's birthday. They learn about mixtures and reactions that occur when ingredients are put together.
The students in Ms. Frizzle's class embark on another journey when the Magic School Bus tours a decomposing log that introduces the latter end of the life cycle and teaches readers that there's more to rot than meets the nose.
The Magic School Bus breaks down in front of a haunted house. Mrs. Frizzle and her students hear spooky sounds and learn about vibration, sound waves, and musical instruments.
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