You are hiking in eastern Canada over a surface composed of very old igneous and metamorphic rocks. In geologic terms, you are most likely walking across a(n) ____.

Question

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The presence of very old igneous and metamorphic rocks indicates that the area is likely a shield, which is a large area of stable, ancient crust. Continental shelves and rises are usually composed of sedimentary rock, while platforms are less defined geologically. Orogenic belts are areas of mountain building, which would not be indicated by old rocks unless they were uplifted more recently.

You Are Hiking in Eastern Canada Over a Surface Composed