This book is a significantly updated sixth edition of a popular and widely used introductory text in ocean sciences. The audience—students without a strong background in mathematics, chemistry, physics, geology, or biology, but with a basic curiosity and interest in the oceans—is an increasingly large group at most universities, where such introductory courses are offered to fulfill distributional requirements in physical science. In this latest version, the Duxburys have teamed up with Keith Sverdrup to expand sections on geology, tectonics, and seismology, and add descriptions of major interdisciplinary research programs. Almost every subject about the ocean is addressed in some way, and a rich array of additional sources of information is provided through sidebars on special topics, Internet links, and a text Web site.