Waves and Tides

by Patricia Armentrout

Published 1 July 1996
Discusses the causes of ocean waves and tides and their effects on both people and the earth.

The Ozone Layer

by Patricia Armentrout

Published 1 July 1996
Describes the ozone layer, explains how it is broken down, and suggests ways to reduce air pollution.

Caves

by Patricia Armentrout

Published 1 July 1996

Lights in the Sky

by Patricia Armentrout

Published 1 July 1996
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.

Ocean Currents

by Patricia Armentrout

Published 1 July 1996
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.