Explores the question of how mountains are made, how they are changed by weather, wildlife, and the efforts of humanity, and how they and their resources may be protected.
Describes the climate and plant and animal life of the jungles of the world and discusses the impact and effect of humanity in studying, invading, or destroying these jungles.
Describes chemical, geological, and biological aspects of the oceans of the world and discusses the impact and effect of human beings in exploiting, polluting, and trying to save the oceans.
