Explains with color illustrations and photographs, how the forces inside the earth create mountains, how weather wears down or erodes mountains, and how mountains become a part of the land mass.

Describes the characteristics of deserts, how they are formed, and the plants and animals that live in them.

This book describes crocodiles in their natural homes and explains how their lives are in danger.

This book describes polar bears in their natural homes and explains how their lives are in danger.

Story of how a typical river starts and ends.

Tells about kangaroos and other pouched mammals: where they live, what they eat and how they survive.

Color photographs, diagrams, and brief text describes typical glaciers and explain what factors contribute to their formation.

Photographs and text explore such inventions as the wheel, gears, levers, clocks, telephones, and rocket engines.

Describes the animals inhabiting the polar regions of the world and how they have adapted to the climate there.