Princess Hyacinth can't go outside because, unless she wears specially-made clothes, she will float away, but things improve when she meets kite-flying Boy.
The kids from Ms. Frizzle's class learn lessons about why objects float or sink when they board the Magic School Bus--tranformed into a bus-boat--to investigate a report of a monster living in Walker Lake.
Illustrates with experiments how objects displace water to stay afloat, why some objects float and others sink, and why the water's ability to sustain weight makes swimming, diving, and other water sports possible.
