Open access textbooks on Earth Systems, Plate Tectonics, Geothermal Energy and GIS are available at no cost to teachers and students.

Ecosystems, Conservation, Ocean Studies, GIS, Hydrology - you can download free digital textbooks on all this and more from the Earth Science section of National Academies Press. Price listed is for delivery of paperback copies.

MIT's Earth, Atmospheric, and Planetary Sciences department offers an extensive series of online courses. Courses generally include lecture videos, assignments, exams, and more.

Students can get certificates in virtual labs covering Earthquakes and Geological Dating.

An animated, video, html, lesson about plate tectonics that includes Wegner's hypothesis, the Theory, the driving forces, the three plate boundaries, convection curreents, hot spots, and plate tectonic reconstruction.

Contains 4,714 individual mineral species descriptions with links and a comprehensive image library.

Blogs, images and videos highlighting local geological news, history and places of interest. Constantly updated.

The entire run of Calfornia Geology Magazine is available online from the California Department of Conservation. Great information for those teaching or studying local geology.

Hosts more than 3,100 maps, 1,400 reports,and 600 Geographic Information System (GIS) datasets representing more than 150 years of history. Digital copies (in pdf format) are available for free download.