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Explains the science of sound, discussing such concepts as waves, pitch, and frequency, and includes related experiments.

Explains the science of motion, discussing potential and kinetic energy, force, gravity, friction, and speed, and includes experiments and an annotated list of Web sites and books.

This book describes the rising of water into the air, the water that falls from the clouds, and the water that sinks down into the ground and discusses how humans pull water out of the water cycle to use.

Explores how science uses clues from nature to determine the age of the earth and some of the blocks of time that describe periods in the evolution of the earth.

This book is an introduction to heat energy, explaining its sources and its use in engines that run most of the machines we use.