Branley, Franklyn Mansfield

A simple explanation of how the rotation of the earth causes night and day.

Explains the phases of the moon--the changes that seem to happen to it as it goes around Earth.

Describes the nine planets and other bodies of the solar system; includes directions for making models showing the size of the planets and their distance from the sun.

Explains how and why a thunderstorm occurs and gives safety steps to follow when lightning is flashing.

Discusses why earthquakes happen, what their sometimes devastating effects can be, where the danger zones are, and what measures people can take to safeguard themselves.

Describes various scientific theories which explore the extinction of the dinosaurs.

Explains the natural phenomena of lightning and thunder.

Introduces the principles of the metric system through simple experiments.

Describes how sunshine and the tilt of the earth's axis are responsible for the changing seasons.

Describes the various properties of air and shows how to prove that air takes up space and that there is air dissolved in water.