Relating to, caused by, or resulting from erosion; characterized by the wearing away of material.
From 'erosion' plus the suffix '-al' (relating to). This adjective became standardized in geological terminology during the late 19th and early 20th centuries.
Geologists identify 'erosional features' like gorges, gullies, and canyons to understand the history of a landscape—they're like reading the geological autobiography of a region.
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