Geology - By Category
Geology of the USA
Geology of each of the 50 states in the United States, plus Washington DC and New York City.
Minerals & Gemstones
All about minerals and their precious cousins, the gemstones.
About Rocks & Rock Collecting
Rocks of all types: how they form, what they mean, how to identify them.
Landforms and Geologic Features
About landforms, geologic features and the geologic structures that form them.
Plate Tectonics
Introductory and general sources.
Earthquakes, Volcanoes and Other Natural Hazards
Earthquakes, volcanoes, and other natural hazards.
Mineral Resources, Soil & Water
Deeper resources on mineral resources, soil and water.
Geologic Maps
Geologic maps for the world, for countries, for localities and for eras in the past.
Climate Change, the Ocean, Glaciers and the Atmosphere
About climate change from the geological viewpoint, along with the science of the ocean, ice and atmosphere.
Geology and Civilization
Where geology meets the larger culture of everyday life.
Geology Careers and Jobs
Careers in geology, job opportunities and what geologists do.
Teaching and Learning Geology
Geology resources for students, teachers and hobbyists.
The Deep Earth and Other Planets
The deep structure of planet Earth and the geology of its sister planets.