[trench] (c) Any long, narrow cut or excavation produced naturally in the Earth’s surface by erosion or tectonic movements. Also, a similar feature produced artificially, such as a ditch.
Source: AGI Glossary of Geology, 4th edition, 1997
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.
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