» Dictionary of Petroleum and Oilfield Terminology    Glossary of terms. The list is searchable and also contains links to further information.    http://www.anson.co.uk/oilfield_glossary.html

» Geological and Gem Terminology    Jillian Banfield's glossary of geological and gem-related vocabulary.    http://seismo.berkeley.edu/~jill/glossary.html

» 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    Indexed glossary of geology terms.    http://college.hmco.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

» Schlumberger Oilfield Glossary    Defines many terms related to oil and gas exploration and production. Includes illustrations.    http://www.glossary.oilfield.slb.com/

» USGS Photo Glossary of Volcanic Terms    Illustrates and describes commonly used volcano-related terms.    http://volcanoes.usgs.gov/Products/Pglossary/pglossary.html

» Volcanic and Geologic Terms Glossary    Common terms defined.    http://volcano.und.nodak.edu/vwdocs/msh/llc/is/vgt.html