By Mikayla McGrath and Abigail Wiebe
The Canadian Shield is the largest geographic land location in Canada that consists of rock from the Precambrian era. That means the rock on the Canadian Shield is 540 million to 4.8 billion years old as well as approximately 8 million square km (Britannica, 2016). The Canadian shield is not only in Canada, it expands to Greenland and down to the North Eastern States, such as Minnesota, Wisconsin, Michigan, and New York. in a simplified explanation, the Canadian Shield was once Mountains millions of years ago but through the process of erosion, water, wind and glaciers from the ice age it eventually wore down the rock to make a flatter surface (Polsky, n.d). Over these millions of years' valleys, lakes, and rivers were from by natures forces.