Historical Features are physical or cultural features that are no longer visible on the landscape. Examples: a dried up lake, a destroyed building, a hill leveled by mining. The term makes no reference to the age, use, or any other aspect of the feature. A ghost town, for example, is not a historical feature if it is still visible.
Glacier - Body or stream of ice moving outward and downslope from an area of accumulation; an area of
relatively permanent snow or ice on the top or side of a mountain or mountainous area (icefield,
ice patch, snow patch).