Plate tectonics. Composition and Physical Layers of the Earth. Composition. The Earth is composed of three main layers based on the differences in chemical make up 1. the crust 2. the mantle 3. the core. Composition of the Earth’s crust.
1. the crust
2. the mantle
3. the core
4. Outer core
5. Inner core
*Differences in pressure and temperature cause STRESS which separates the Earth into physical layers.
- remember studying convection in weather?
Why is the inner core solid and the outer core liquid when they are both made up of the same element iron?