OCEANOGRAPHY: AN INVITATION TO MARINE SCIENCE by Tom Garrison 3rd Edition, 1998 Wadsworth Pub. Co., ISBN 0534530826; accompanying study questions answer key ISBN 0534530850 (Expensive but appears to be the best textbook according to various reviews).
PRINCIPLES OF OCEANOGRAPHY by M. Grant Gross, 7th Edition, 1995 Prentice -Hall ISBN 0023479817 Textbook for non-science majors. Said to be appropriate as a "stand-alone text for one-quarter introductory high school or college course". (previous editions were titled OCEANOGRAPHY)
BIOLOGICAL OCEANOGRAPHY: AN INTRODUCTION by Carol M. Lalli, 1997 (Butterworth - Heinemann) ISBN 0750633840 An undergraduate textbook for students who have had previous course in biology)
ESSENTIALS OF OCEANOGRAPHY by Harold V. Thurman (MacMillan College Division) There are several editions of this textbook. 4th Edition, 1992 ISBN 0024208027; 1998 edition ISBN 0137273487 Co-authored by Thurman and Al Trujillo. For students with no formal math or science background / college-level first year oceanography. Many instructor helps also available (slides,transparencies, web site references, instructor's manual, etc.)
INTRODUCTION TO OCEANOGRAPHY by Harold V. Thurman (Prentice Hall), 1997, Student edition ISBN 0132620723
EXPLORING OCEAN SCIENCE, 2ND EDITION by Keith Stowe, 1996 (John Wiley & Sons). Instructor's manual and transparency are also available. ISBN 0471128422
METHODS IN INTRODUCTORY OCEANOGRAPHY by Bruce F. Rowell, Wendy L. Ryan, 1996, (WCB / McGraw Hill) ISBN 0697280160. A hands on approach / lab manual.
FUNDAMENTALS OF OCEANOGRAPHY by Duxbury ($58.95) 1993 WCBM / McGraw-Hill, ISBN 0697146464, Student Guide by Alison Duxbury, Keith Sverdrup, 1998 ISBN 0697374556
OCEANOGRAPHY: AN ILLUSTRATED GUIDE (could be used as textbook) by C. P. Summerhayes, S. A. Thorpe, 1998 John Wiley & Sons ISBN 0470345373
INTRODUCTORY OCEANOGRAPHY by Franz Anderson 1998 Kendall/Hunt Publishing Company ISBN 0787254584
LABORATORY EXERCISES IN OCEANOGRAPHY 2nd Edition by Bernard W. Pipkin 1987 WH Freeman & Co. ISBN 0716718103
An oceanography / marine science elective course is available from Core Curriculum of America ( http://core-curriculum.com ).
****Some related web sites which might also prove helpful include:
http://inspire.ospi.wednet.edu:8001 (information and related links )
http://www.school.discovery.com/schrockguide/sci-tech/scies.html (look under the oceanography subtitled area)
http://www.oceanlink.island.net (multiple links)
http://www.seaworld.org/teacherguides/teacherguides.html (teacher's K-12 guide: SAVING OUR SEAS)
http://www.studyweb.com (science, oceanography, etc.)