The first layer of the Earth is the crust. This layer is five miles deep and is the second lightest layer, volume-wise. Next, is the mantle. The mantle is a liqid layer that is 1800 miles deep it has the largest volume of all the layers. It's temperature is 4000 degrees Fahrenheit. The outer core is so hot that all the rocky contents are liquid (9000 degrees F). This layer is 1400 miles thick, it is also composed of melted nickel and iron. The inner core is so pressurized that the metals are forced to become solid and fibrate in one place. Inner core is 4000 miles under the surface and is 800 miles across. There is 45,000,000 pounds of pressure per square inch (3,000,000 times the air pressure at sea level).
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