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.