Multiple choice

The outer planets--Jupiter, Saturn, Uranus, Neptune are made up of ___

  1. carbon, oxygen, and methane

  2. iron, nickel, and carbon dioxide

  3. water, carbon dioxide, ammonia, and methane

  4. hydrogen, helium, and water

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

The outer gas giants are primarily composed of lighter elements and compounds like hydrogen, helium, water, methane, and ammonia. Option C is the most accurate description of the volatile composition of these planets.