"An apple floats in a tub of water, but a ball of aluminum foil sinks to the bottom. But wait. If that same ball of foil is flattened out and shaped into a boat, it floats! How can that be? David A. Adler's clear, concise text and Anna Raff's delightful illustrations explain the basic principles of flotation and density in a way that will really sink in"--

Describes floating and sinking.

Is there a water monster living in Walkerville Lake? To find out, Ms. Frizzle turns the Magic School Bus into the Magic Bus-Boat, which sinks to the bottom of the lake and gets to the bottom of the mystery.

Uses simple experiments and activities to explore concepts such as density, upthrust, and water displacement and to explain why objects float or sink.