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Ice sheets over a kilometre thick covered most of the NWT except for parts of the mountains. Glacial ice advanced and retreated four times. The present landscape was scoured and shaped by the ice movements.
The weight and movement of the ice ground the rocks into gravel and sand. This material was transported and deposited, reshaping the landscape.
Glacial material provides us with industrial resources like gravel and sand.
Boulders and till deposited by glaciers can be used to trace back to the source of mineral deposits.