Question

question: 2
the outer planets are made mostly of what substances?
a silicate minerals
b. water and carbon dioxide
c. hydrogen and helium
d. water ice and sulfur

Explanation:

The outer planets (Jupiter, Saturn, Uranus, Neptune) are gas giants. They are composed mainly of hydrogen and helium. Silicate minerals are more common in inner rocky planets. Water, carbon dioxide, water ice, and sulfur are not the primary components of outer planets.

Answer:

C. Hydrogen and helium