What is the proportion of igneous, metamorphic, and sedimentary rocks in the Earth's crust?

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12.5% igneous - 12.5% metamorphic - 75% sedimentary64.7% igneous - 27.4% metamorphic - 7.9% sedimentaryNeither option A nor B is correct7.9% igneous - 27.7% metamorphic - 64.4% sedimentaryNot listed

Explanation

The Earth's crust is composed predominantly of sedimentary rocks, making up about 75%, while igneous and metamorphic rocks each account for approximately 12.5%. Therefore, the correct distribution is 12.5% igneous, 12.5% metamorphic, and 75% sedimentary.