Rivers

By Norman V. Carlisle

Describes how a river begins and grows and how it influences the land that it flows through. Also discusses the many ways people use rivers and the importance of keeping them clean and unpolluted.

Bridges

By Norman V. Carlisle

Briefly discusses the first bridges, famous and unusual bridges, and bridge design and construction.

Rivers

By Madelyn Carlisle, Norman Carlisle

Let's investigate beautiful, bouncy balloons

By Madelyn Carlisle

Traces the history of ballooning from the eighteenth century to the present and discusses different kinds of balloons and their uses in science, travel, and sports.

Let's investigate marvelously meaningful maps

By Madelyn Carlisle

Introduces all kinds of maps including weather, topographic, road, and undersea; and explains such terms as scale, projections, symbols, latitude, and longitude.

Let's investigate sparkling, silent snow

By Madelyn Carlisle

Discusses such aspects of snow as the shape of snowflakes, record snowfalls, and how humans and animals adapt to snow. Also includes activities and experiments.

Let's investigate soft, shimmering sand

By Madelyn Carlisle

Discusses what sand is, how it is formed, how beaches and dunes are built up, how concrete and glass are made from sand, and how animals and plants survive in the desert.

Let's investigate slippery, splendid sea creatures

By Madelyn Carlisle

Presents the lives and characteristics of such sea creatures as whales, sharks, seals, and corals.

Beautiful Bouncy Balloons Let s Investigate

By Madelyn W. Carlisle

Magical Mysterious Meteorites Let s Investigate

By Madelyn W. Carlisle