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An immense collection of daily and archived earth and space science digital images and database information sources are readily accessible to K-12 teachers through the Internet and the World Wide Web. However, these abundant electronic resources are designed for scientists and often need to be modified to benefit students. Advances in hypermedia as an instructional tool for earth system science education provide a mechanism for designing user-friendly and structured classroom units based on this available data. Two models proposed as a foundation for materials development are the Learning Cycle Model and the Investigation/Experimentation Model. A high demand for Internet-based curricular materials development to take advantage of the current technology suggests an educational research agenda to determine which lesson formats are most effective for learners.