Seas and Oceans

by John O. E. Clark

Published 25 June 1992
Discusses the formation of the world's oceans, their various layers, currents and waves, marine life, and other related topics. Includes projects.

The Atmosphere

by John O. E. Clark

Published 1 October 1992
Discusses the composition and structure of the Earth's atmosphere and such atmospheric phenomena as air pressure, weather, winds, pollution, and the greenhouse effect. Includes related projects.