preview the IMAX film, Mysteries of the Great Lakes preview the PowerPoint Presentations (can be shown to students in its entirety or in segments as themes are presented). preview and/or download background information: Story: Meeting the Ambassador Great Ambassador Activity Environmental Pressures on Lake Sturgeon Reading Card Testing the Waters The History of the Great Lakes Written in Stone Animal Classification Answer Key for Vertebrate Classification Activity 2 Culminating Activity: Welcome to the Great Lakes make copies of the following: Story: Meeting The Ambassador Environmental Pressures on Lake Sturgeon Reading card Looking for Solutions Worksheet Testing the Waters — Types of Water Reading Card Testing the Waters — Properties of Water Reading Card Testing the Waters — Water Experiments Part I: Measuring Water Density Part II: Testing Water Acidity Part III: Filtering Suspended Sediment and Particulate Matter The Year the Earth Formed: Geological Timeline of the Great Lakes Activity Vertebrate Classification Activity 1 Vertebrate Classification Activity 2