1. Mantle: This is the thickest layer, extending from about 30 kilometers (19 miles) below the surface to about 2,900 kilometers (1,800 miles). It makes up about 84% of Earth's total volume.

2. Outer Core: While much thinner than the mantle, the outer core is still a significant layer, extending from 2,900 kilometers (1,800 miles) to about 5,150 kilometers (3,200 miles) deep.

3. Inner Core: The innermost layer, the inner core is a solid ball of iron and nickel with a radius of about 1,220 kilometers (758 miles).

The crust is the thinnest layer, but it's the one we live on. It's divided into oceanic crust, which is thinner and denser, and continental crust, which is thicker and less dense.