Identify the various layers of the earth in order from interior to the outermost layer:

The Earth's layers from the deepest interior to the outermost are: (1) Inner core (solid iron-nickel at the center), (2) Outer core (liquid iron-nickel), (3) Mantle (semi-solid silicate rock), and (4) Crust (the thin outermost solid layer where we live). So the correct order from interior to outermost is: Inner core, outer core, mantle, crust.