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Layers of the Earth

Crust

Thickness: 8-70km
Temperature: Around 22 degrees Celsius
State: Solid
Composition: Iron, Oxygen Silicon, Magnesium, Aluminum, Granite, Sedimentary Rocks, and Metamorphic Rocks


Mantle
Thickness: 2,660km
Temperature: 1,400 - 3,000 degrees Celsius
State: Liquid/Solid
Composition: Iron, Oxygen, Silicon, Magnesium, and Aluminum

Outer Core
Thickness: 2,260km
Temperature:4,000-6,000 degrees Celsius
State: Liquid
Composition: Iron, Nickel, Sulphur, and Oxygen

Inner Core
Thickness: 1,228km
Temperature: 5,000-6,000 degrees Celsius
State: Solid
Composition: Iron and Nickel

Tectonic Plates
A tectonic plate is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across.

There are 7 major tectonic plates on Earth.  
Tectonic Plates are responsible for all of Earth's Continents slowly moving (2-5 inches a year)