Keywords

[contaminant] (a) Any physical, chemical, biological, or radiological substance or matter that has an adverse effect on air, water, or rocks (U.S. Environmental Protection Agency, 1994). (b) An undesirable substance in water, air or rocks that is either not normally present or is an unusually high concentration of a naturally occurring substance. Syn: pollutant.

Geological keywords, such as “granite”, “lake”.  The definitions are generally taken from the AGI Glossary of Geology.  Keywords with a geographic context (e.g. Cape Smith Fold Belt, Selwyn Basin, Grenville Province) are assigned to a separate category.