Question

Which phrase describes the composition of the outer planets?

are gaseous
contain water
have high densities
are made mostly of liquid

Answer 1

The phrase that best describes the composition of the outer planets is **"are gaseous."** The outer planets, also known as the gas giants (Jupiter, Saturn) and ice giants (Uranus, Neptune), are primarily composed of hydrogen, helium, and other gases, although they also contain ices and liquids in their deeper layers.