Earth Science Glossaries, Dictionaries, and Encyclopedias

American Heritage Dictionary - Geology is the online American Heritage geology dictionary.  Appropriate for all age groups.

Geology Dictionaries is an index of many different online earth science and geology dictionaries, including a “Referenced Glossary for Planetary Geology for Teachers.”  Appropriate for all age groups.

Geology Dictionary  is a thorough dictionary of geology and earth science terms.  Appropriate for all age groups.

Geologylink is the Houghton-Mifflin glossary of geologic terms.  Most appropriate for high school and college students.

Paleontology and Geology Glossary is an illustrated glossary of geologic terms, emphasizing paleontology.  Most appropriate for high school students.

Science in Your Watershed Glossary is a complete glossary of hydrologic terms.  Most appropriate for high school and college students.

Water Quality Glossary is a thorough glossary of water science terms.  Most appropriate for college students.

Water Science Dictionary of Terms is a brief glossary of hydrologic terms authored by the United States Geological Survey.  Most appropriate for high school students.