Kettle (landform)
shallow depression formed by a retreating glacier / From Wikipedia, the free encyclopedia
Kettles (also called potholes or kettle holes) are shallow bodies of water. They are filled with sediment. They are formed by retreating glaciers or by draining floodwaters.
Potholes can be formed when big blocks of ice break off of glaciers. The blocks become covered by sediment the glacier leaves behind. When the block melts, the hole it leaves behind is a pothole.
Potholes can also be formed when an ice-dammed lake suddenly drains away. As the ice melts, ramparts can form around the edge of the pothole. The lakes that fill these holes are usually 10 m (33 ft) deep or less. They eventually become filled with sediment. In acid conditions, a bog may form. In alkaline conditions, it will be peatland.