Geography • World GeographyHard
With reference to the structural relief features of North America, the Canadian Shield is predominantly composed of which of the following geological formations?
A. Young folded sedimentary strata rich in petroleum deposits
B. Ancient Precambrian igneous and high-grade metamorphic rocks exposed at the surface✓ Correct Answer
C. Volcanic plateau basalts formed during recent Cenozoic fissure eruptions
D. Alluvium-filled depositional basins formed by glacial meltwater outwash plains
💡 Solution & Explanation
The Canadian Shield forms the stable continental nucleus of North America, composed of ancient Precambrian crystalline basement rocks that have undergone extensive erosion and glaciation. Sedimentary strata are typically found flanking the shield in interior lowland basins. Volcanic plateaus characterize regions like the Columbia Plateau. Glacial outwash plains cover localized areas rather than the core shield region. Crystalline shields worldwide contain valuable deposits of metallic minerals such as nickel, copper, and gold.
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