The crust is the second least important layer of the Earth because it only makes up about 0.3% of its total mass.
The second least important layer of the Earth is the crust.
The crust is the top layer of the Earth, covering only about 0.3% of its total mass.
While it is the easiest layer for geologists to study, it is not as significant as the other layers in terms of the Earth's overall composition and structure.
Learn more about Earth's layers