Question

What is the only truly liquid layer of the earth?

A) inner core
B) outer core
C) lower mantle
D) Upper Mantle

Answer 1

The outer core layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles (2,300 km) thick.

Answer 2

The answer is outer core liquid iron and nickel.