Read all about earthly oddities

Describes various kinds of lights seen in the sky including rainbows, lightning, and the aurora borealis.

Explores the nature, location, and causes of hot springs, including those that gush hot water and steam into the air and are called geysers.

Describes the ozone layer, explains how it is broken down, and suggests ways to reduce air pollution.

Discusses the causes of ocean waves and tides and their effects on both people and the earth.

Examines the great movements of water called ocean currents, discussing how they are mapped, what keeps them moving, and how they can affect the weather.

Describes the formation and different parts of caves, including the entrance zone, twilight zone, and dark zone.