Keywords

The generally dark, more or less stable part of the organic matter of the soil, so well decomposed that the original sources cannot be identified.  The term is sometimes used incorrectly for the total organic matter of soil, including relatively undecomposed material.

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.