This third edition of Essentials of Oceanography conveys Garrison's enthusiasm for oceanography to non-science students taking the introductory course. It is a streamlined version of his best-selling Oceanography text, but was created specifically to meet the needs of the shorter course. This text provides students with a basic understanding of the scientific questions, complexities, and uncertainties involved in ocean use and the role and importance of oceans in nurturing and sustaining life on the planet. It further enhances students' natural enthusiasm for the ocean with integrated technology and a stunning visual program. This revision presents the most current scientific information on topics such as global warming as well as an improved and expanded illustration program. In addition, there is an increased emphasis on the interdisciplinary nature of marine science, stressing its connections with astronomy, physics, chemistry, meteorology, geology, biology, ecology, history, and economics. Garrison brings focus and excitement to students' appreciation of the complex nature of the ocean and its interactions with other systems. Tom Garrison recently held student focus groups to discuss their impressions of Essentials of Oceanography and to hear their suggestions for improving the text. Nearly all changes to this new edition stem from student suggestions.