As mentioned in Part I, certain classroom activities can help students learn about the ocean and empower them to make informed decisions about their impacts on the environment. One such activity focuses on harmful algal blooms (HABs). In this article, the authors include background information on HABs and then present two activities. Activity 1 is designed to provide student background information on the various species of algae involved in HABs. Students will need to share their cartoons with classmates to complete the data table. This may be done as a large group or by organizing students into smaller groups. Activity 2 asks students to explore the Maryland Department of Natural Resources website for archived data and to print graphs. [For Part I see EJ758657.]