See also:
Geology Dictionary - Geology.com Definitions of terms, written at a level appropriate for students in introductory courses. http://geology.com/geology-dictionary.shtml
Geologylink - Glossary Glossary covering all matters geological. Suitable for students, university instructors, and professional geologists. http://college.cengage.com/geology/resources/geologylink/glossary.html
Glacier Glossary An A-to-Z glossary of glacier terms written by the professor and students of an NEIU glaciology class. http://ebeltz.net/glacier/glacglos.html
Glossary of Volcanic and Geologic Terms Part of Vulcano World, a higher education, k-12, and public outreach project of the Oregon Space Grant Consortium administered by the Department of Geosciences at Oregon State University. http://volcano.oregonstate.edu/education/glossary.html
Schlumberger Oilfield Glossary Defines many terms related to oil and gas exploration and production. Includes illustrations. http://www.glossary.oilfield.slb.com/
Visual Earthquake Glossary Provides terms and their definitions, each with an image. Edited by the USGS (U.S. Geological Survey) Earthquake Hazards Program. http://earthquake.usgs.gov/learning/glossary.php