The inner planets of the solar system (Mercury, Venus, Earth, and Mars) are composed mostly of _____ while the outer planets (Jupiter, Saturn, Uranus, and Neptune) are composed mostly of _____.

The inner planets of the solar system (Mercury, Venus, Earth, and Mars) are composed mostly of _____ while the outer planets (Jupiter, Saturn, Uranus, and Neptune) are composed mostly of _____. a. metallic and rock materials; methane and ammonia ice […]