Answer: The correct answer is C) Crust.
Earth is primarily composed of four layer from outside to inside. These layers are as follows-
1) Crust- It is the outermost layer of earth, which comprises of two basic rocks that is granite and basalt. It is hard and thinnest layer of the planet earth.
2) Mantle- It lies beneath crust and it is a thicker layer of very hot and dense rock.
3) Outer core- It lies beneath mantle and it is a layer of low viscosity fluid ( molten form). It is responsible for the magnetic field of earth.
4) Inner core- It is the innermost layer with extremely high temperature and pressure.
