The ocean affects all of our lives. Therefore, awareness of and information about the interconnections between humans and oceans are prerequisites to making sound decisions for the future. Project ORCA (Ocean Related Curriculum Activities) has developed interdisciplinary curriculum materials designed to meet the needs of students and teachers living in Washington State. Each activity packet provides the teacher with a set of lessons dealing with a particular topic related to the oceans. Included are student worksheets, lesson plans, a vocabulary list, and a bibliography. This activity packet is designed to introduce senior high school students to some basic concepts of marsh, estuary and wetland ecology. Each of these habitats comprise an important link in the cycling of water through a watershed. A review of the watercycle and an introduction to the classification of watershed systems sets the stage for further investigation into each habitat. Field experiences focus learning on very specific features of the wetlands and marshes. Data for a site is collected through scientific analysis and an inventory of the hydrology, vegetation and wildlife, and the visual, cultural, economic, and educational values for that site. (TW)