How did glaciation affect the Canadian shield?

Glaciation significantly shaped the Canadian Shield by eroding its surface and sculpting the landscape, resulting in features like lakes, valleys, and rugged terrain. The weight of advancing glaciers compressed the land, while their retreat left behind a mosaic of exposed rock and sediment deposits. This process also created rich mineral resources, such as nickel, copper, and gold, making the region economically valuable. Overall, glaciation played a crucial role in defining the geological and ecological characteristics of the Canadian Shield.