Question

the only part of earths inner structure that is a liquid is the

a. outer core
b. lower mantle
c. crust
d. inner core

Explanation:

The Earth's inner structure consists of the crust, mantle, outer core, and inner core. The outer core is a liquid layer composed mainly of iron and nickel. The lower mantle is solid (although it can flow slowly over geological time scales). The crust is solid. The inner core is solid due to the extreme pressure despite the high temperature.

Answer:

A. outer core