Question

From least to most dense, what is the correct order of Earth's four major layers?
A.
crust, outer core, inner core, mantle

B.
inner core, outer core, mantle, crust

C.
crust, mantle, outer core, inner core

D.
mantle, inner core, outer core, and crust

Answer 1

C. crust, mantle, outer core, inner core

Reason: the crust (light silicate rocks) is least dense, the mantle (denser silicates) is next, the outer core (liquid iron–nickel) is denser, and the inner core (solid iron–nickel) is the most dense.