What are the main four layers in the earth and what material do they have?

The Four Layers Of Earth       

(1.) CRUST :  (The Rocky Surface Layer Of Earth) Is Made up of:

 Mostly Oxygen, Silicon, Aluminum, Iron, Calcium, Sodium, Potassium and Magnesium.

(2.) MANTLE :  (Above Earths Core is the Mantle) Made Up of Rock: 

Containing Silicon, Iron, Magnesium, Aluminum, Oxygen and Other Minerals.
 
(3.) OUTER CORE : (Third Layer Of the Earth) NOTE- It Is The Only Liquid Layer of Earth-

  And is mainly made up of the Metals:

Iron and Nickel, as well as small amounts of other substances.  NOTE:
-The Outer Core Is Responsible For Earths Magnetic Field-

(4.) INNER CORE:  NOTE: The Very Middle Of Earth.
Consists of very high pressure at a high temperature. 

Made of SOLID Iron-Nickel instead of a liquid.