Question

Thickness of crust of earth is:
(A) $0 - 500\,km$
(B) $0 - 400\,km$
(C) $0 - 60\,km$
(D) $0 - 250\,km$

Answer 1

Hint The earth crust is the outermost shell of the earth; it consists of the less than $1\% $ of the volume of the earth. It is the outer cover for the earth and the earth is divided into different types of layer and these layers are having some thickness.

Complete step by step solution
The earth comprises four different types of layers. The thickness of the outer layer of the earth is smaller than the thickness of the inner layer. According to this statement, the outermost layer is made up of the lightest material like rock and granites. And the innermost layer of the earth consists of the strong elements like iron and nickel.
The four types of the layers of the earth are the inner core, the outer core, the mantle and the crust. The crust is the outermost layer of the earth and next to the crust is the mantle and next to the mantle is the outer core and next to the outer core is the inner core.
The crust is the outermost layer where the human can live. The thickness of the outermost layer of the earth crust is about the $0 - 60\,km$. The thickness of the different layers is increasing, the thickness of the mantle is greater than the thickness of the crust, like that the thickness of the outer core is greater than the thickness of the inner core.

Hence, the option (C) is the correct answer.

Note Earth crust is of two types, that are oceanic crust and the continental crust. The oceanic crust means that the ocean is the floor. The continental crust means that the land is the floor. The continental crust is much older than the oceanic crust.