How do the Canadian Shield and the Mackenzie Lowlands differ in landscape?

The Canadian Shield and the Mackenzie Lowlands differ significantly in their geological composition and surface features:

• Geological Foundation: The Canadian Shield is an ancient, rocky Precambrian mass composed of crystalline rock that has been shaped by long histories of mountain building and erosion. In contrast, the Mackenzie Lowlands are underlain by much younger, flat-lying sedimentary rock from the Cretaceous and Devonian periods.123
• Surface Landscape: The Shield is characterized by a "rock-knob" landscape, featuring ice-smoothed hills, thin soils, and an enormous number of lakes and swamps created by recent glaciations. The Mackenzie Lowlands are largely mantled by glacial and alluvial deposits of clay, sand, and gravel. While the Lowlands contain swamps and muskegs, they also support boreal forest vegetation, including spruce and poplar, and offer more favorable conditions for plant growth compared to the rocky, acidic, and often barren terrain of the Shield.1234