This is an introduction to the concept of seafloor spreading proposed by Harry Hess in the early 1960's. This site offers multiple links to further examine this geologic hypothesis. Full description.

These five activities are sequential and are designed to cover introductory volcano topics. Included are objectives, materials lists, procedures, and a selection of related sites for students to access. Full description.

Users can access an extensive selection of Earth Science materials. The institute itself sponsors a series of online exhibits on volcanoes and earthquakes, drinking water, El Nino/La Nina, rockhounding, and petroleum. An extensive selection of links to other resources is also provided. These include geology, geophysics, rocks and minerals, ecosystems, and a set of teacher resources for Earth Science. ... Full description.

This secondary-level educational program in Earth Sciences includes an extensive selection of student learning materials, teacher resources, and assessment tools for a hands-on, inquiry-driven instructional program. Module topics include Earth's geosphere (volcanoes, earthquakes, plate tectonics), understanding your environment (landscape evolution, river systems, land use), Earth's fluid spheres ... Full description.