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Describes what is known about Mercury from the photographs taken by Project Mariner.

Discusses the physical features and moons of the planet Neptune and how we have gained our knowledge of this giant world.

Describes the sixth planet from the sun, its rings, and its moons, and includes photographs taken in outer space.

Introduces, through text and photographs, the characteristics of the seventh planet in the solar system.

Explores new discoveries about dinosaurs and answers such questions as "Were all dinosaurs giants?" "How are dinosaurs named?" "Which was the largest meat-eater?" and "How smart were the dinosaurs?".

Surveys findings on Brachiosaurus, Diplodocus, and four other examples of the largest dinosaurs, including the locations of the discoveries and explanations of their names.

Provides an easy-to-read overview of Egyptian pyramids and the burial practices associated with them, and introduces on the pyramids of other countries.

Describes the movements and physical features of the planet Venus and recent findings about its climate and surface.

Describes nine strange natural phenomena and possible explanations for them, including the day it rained frogs, an atomic explosion that occurred forty years before the atom bomb, and an eerie crystal skull.

Discusses the nature, causes, and destructive capabilities of earthquakes and describes some notable examples.

A simple introduction to the nine planets of our solar system.

Presents an introduction to bears, in simple text with illustrations, providing information on the physical characteristics, habits, and behavior of different kinds of bears.

Provides an easy-to-read overview of the history of aircraft.

Introduces the facts about volcanoes, what they are, why and how they erupt, different types of volcanoes found around the world, and the effects of some famous eruptions of the twentieth century.

Presents information about the vehicles and equipment used to fight fires from the ground, sea, and sky.