An enhanced edition of DKs exhaustive guide to the underwater world This authoritative, sumptuously illustrated encyclopedia is now in its third edition. Illustrated with a blend of beautiful and informative artworks, maps, and photography, it is a broad-ranging, in-depth guide to both physical oceanography and marine life. A comprehensive introduction explains important principles and processes, from the geology of the seafloor to the chemistry of seawater. The next two chapters look at key environments - from the seashore out to the open ocean - and the main groups of ocean life. Both of these chapters include systematic directory