What is the nature of sound and what role does it play in an underwater environment? Objective *What is underwater acoustic monitoring? *What sounds can you hear underwater? *Why is underwater acoustic monitoring important? *How is sound important to marine mammal survival? Background Our "Underwater Acoustics" curricula unit is divided into three lesson plans, each taking one class session to complete. They are part of our "Middle School Scientists" series that explore the fascinating research and resources of Glacier Bay National Park. In this lesson, students begin this investigation by wat Duration: 60 Minutes.