Because of glacial retreat there are many lakes,rivers,streams and pounds. On the edge of the Canadian Shield there are a good deal of lake and waterways for example eastern shores of Lake of the Woods, Lake Huron etc. 2. ... It compressed the bedrock so much that it would not let water pass through. ... It is so thick because lot of the seas where shallow for million years this allowed the sediment rock to accumulate over the years. ... The ancient coral reefs and the Interior Plains are important because they show that there used to be ocean over the plains long ago and the fossils are used...

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• Grade Level: High School