Which is the thickest layer of the earth?
C) Outer Core
D) Inner Core
The mantle is the thickest layer of the Earth, extending from just beneath the Earth’s crust to a depth of about 2,900 kilometers (1,800 miles) below the Earth’s surface. It makes up a significant portion of the Earth’s volume and consists of semi-solid rock that flows over geological timescales. The other layers, including the crust (option A), outer core (option C), and inner core (option D), are thinner layers beneath the mantle.