Kettle (geology)
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A kettle is a geological feature, a depression or an erosion of special kind.
One type of kettles is created by water eroding the softer core area of a rock. When located near a lake shore the wave action causes a bubbling action, similar to a boiling kettle. Kettle Point, Ontario, a First Nation community on Lake Huron in Ontario, Canada has many examples of kettles, hence the name.
Another type is related to melting of glacial blocks.