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The correct statement about the Earth's crust is:
**The Earth's crust is thin and could be compared to an eggshell.**
While the Earth's crust varies in thickness, it is generally much thinner than the other layers of the Earth, with oceanic crust averaging about 5-10 km and continental crust averaging about 30-50 km. This comparison to an eggshell illustrates its relatively thin nature compared to the overall structure of the Earth.