Describes the general characteristics of comets and gives a brief history of Halley's comet discussing its expected reappearance in late 1985-early 1986.
Identifies the continent of North America, divides it into six regions including the Eastern Seaboard, Great Lakes, Arctic Circle, and Central America, and discusses their countries, states, cities, and geographical features.
Briefly describes Africa's regions: the Middle East countries, the Sahara, the equatorial rain forest, the west coast, east Africa, island countries off the southeast coast, and southern Africa.
Describes in simple terms the meteors, comets, and asteroids that are part of our solar system and discusses the various theories concerning their origin and their effect on life on Earth.