Question

which phrase describes the composition of the outer planets? are gaseous contain water have high densities are made mostly of liquid

Explanation:

The outer planets (Jupiter, Saturn, Uranus, Neptune) are primarily classified as gas giants (Jupiter, Saturn) and ice giants (Uranus, Neptune), with their dominant composition being gaseous (hydrogen, helium, and other volatile gases/ices). They do not have high densities (unlike rocky inner planets), are not mostly liquid, and while some contain water ice, "are gaseous" is the core descriptor of their overall composition.

Answer:

are gaseous