1. Put the layers of Earth in order from densest to least dense.
A. Crust, Mantle, Inner core, Outer Core
B. The inner core, Mantle, Outer core, Crust
C. Crust, Mantle, Outer core, Inner Core
D. The inner core, Outer core, Mantle, Crust
2. Which layer plays the greatest role in the movement of tectonic plates?
A. Crust
B. Mantle
C. Outer core
D. Inner core
