Definitions for "Pothole"
A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.
A hemispherical hole in the bedrock of a streambed, formed by abrasion of small pebbles and cobbles in a strong current.
A bowl-shaped depression carved into the floor of a stream by a long-lived whirlpool carrying sand or gravel.
A shallow, small pond that may hold water throughout the year.
a unique habitat that is very easily disturbed
A shallow depression, generally less than 10 acres in area, occurring between dunes on a prairie, often containing an intermittent pond or marsh and serving as a nesting place for waterfowl. (Bates and Jackson 1980.)
Keywords:  cave, moulin, srt, crevasses, vertical
Vertical type of cave (see cave)
A vertical shaft or cave normally requiring ropes & SRT (Single Rope Technique) skills to negotiate.
a nearly vertical channel in ice that is formed by flowing water; usually found after a relatively flat section of glacier in a region of transverse crevasses; also called a moulin.