Marshes, swamps and bogs are all ""between lands"" that are slowly changing from water to dry land. Buck explains how the changes come about, describes how bogs are formed and how studying them can yield information about vegetation and climate of the past, discusses the various plants that appear at different stages in the evolution of wetlands and the animals who visit or inhabit them, and ends by specifying why ""people need wetlands"" although ""wetlands could get along nicely without people."" Not claiming to be anything more than a supplement to classroom materials, this covers the subject in a straightforward and intelligible manner.