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Unlike a river, a glacier of ice may be many thousands of feet thick. This creates a significant pressure on the bed of the glacier - the rock on wich it rests.
At the base of a glacier is a quantity of rock rubble, which is thus ground along the bed under the weight of the ice above. This glacier bed is able to deepen a portion of its course, much deeper that its natural outlet.
Lake Manapouri for example, has a surface level of about 177m above sea level, but its deepest point is 444m. My local lake Wanaka, is 150km from the (drainage) coast has a surface level of just under 300m, but the deepest point is a number of metres below that. The glacier that created this lake was over 1000m thick - easily read from scouring of the mountains around.
Eventually in a warming period, the glacier retreats and in that phase retreats quite fast, much faster than the river inflows can fill it with gravel and silt.
But in the long run, it will be filled. All lakes are temporary features (land warping excepted).
The same is true of Fiords, they are quite deep a few kilometres in from the coast, but at the point where they enter the ocean, their bed rises sharply as any ice beyond that is broken off by buoyancy processes.
Also but minor, the glacier creating the fiord dumps its residual moraine debris at that point, as a mound at the mouth. So a fiord is a lake without a confined outlet.
What else can I help you with?
How were the 5 lakes form?
From a glacier
What were the great lakes carved by?
The Malaspina Glacier carved the Great Lakes.
Can a glacier create a forest?
No, a glacier cannot
What glacier dug out the Great Lakes?
canadian shield
How can movement of glaciers cause lakes to form?
As glaciers move, they can carve out deep depressions in the land called cirques. When the glacier retreats or melts, these cirques can become filled with water, forming lakes. Glaciers can also create moraines, which are piles of debris that dam up valleys, creating lakes behind them.
Is glacial lake caused by erosion or deposition?
A glacial lake is a lake with origins in a melted glacier. Near the end of the last glacial period, roughly 10,000 years ago, glaciers began to retreat. A retreating glacier often left behind large deposits of ice in hollows between drumlins or hills. As the ice age ended, these melted to create lakes. These lakes are often surrounded by drumlins, along with other evidence of the glacier such as moraines, eskers and erosional features such as striations and chatter marks.
What are the Waterforms in US?
water fall glacier lakes desert
Was the great salt lake formed by a glacier?
yes from the cintinental period a glacier swept acrost and made a hole and the glacier melted and formed the salt lakes
Glacier movement formed which body of water?
Glacier movement has formed various bodies of water, including fjords, lakes, and rivers. When glaciers advance and retreat, they carve out deep valleys that can fill with water to create these different water bodies.
What are two things formed by an alpine glacier?
erosion and glacial lakes
What forms when a glacier erodes a river valley?
Fiords and glacial lakes
Which of earths sphere includes the oceans groundwater lakes and glacier?
Hydrosphere
