The two true descriptions of Earth's interior layers are:
- The asthenosphere is located below the lithosphere.
- The mantle is composed of silicate material.
The crust is primarily composed of silicate rocks (not iron, nickel, and sulfur), the outer core is composed of molten iron and nickel, which are similar to the inner core's composition, and the mesosphere is not the outermost layer of Earth; rather, it's part of the mantle located below the asthenosphere.