Multiple choice

The outer core is composed mainly of ______ while the inner core is almost entirely composed of iron.

  1. aluminium-zinc

  2. nickel-iron alloy

  3. manganese-nickel

  4. chromium-molybdenum

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth's outer core is primarily composed of iron and nickel in liquid state, while the inner core is solid and almost entirely iron with some nickel. The other options (aluminium-zinc, manganese-nickel, chromium-molybdenum) are not major components of Earth's core structure.