Science interactives exploring continental drift throughout history, plate action, the rock cycle, the spheres of the Earth, heat & pressure, and more.
Vetted case studies with complete lessons and materials. The principle is that by teaching in a case study format, it fosters higher-order thinking with a focus on cooperative, project-based learning strategies. The topics tend to be current and encourage debate. A search filtering by grade level found over 200 lessons for high school.