What Is the Principal Difference Between the Inner Core and Outer

Multiple Choice

What is the principal difference between the inner core and outer core?

A) The inner core consists mainly of iron and nickel, while the outer core consists mainly of silicate minerals.
B) The inner core consists mainly of silicate minerals, while the outer core consists mainly of iron and nickel.
C) The inner core is solid while the outer core is liquid.
D) The inner core is liquid while the outer core is solid.