Answer
Planets fall into two groups, based on location, size, and density. The terrestrial planets (Earth, Venus, Mercury, Mars) are dense and have relatively large cores, which are comprised of iron and nickel. Jovian planets have relatively small cores. Additionally, Jovian planets have very thick atmospheres, which are composed mainly of hydrogen and helium. Terrestrial planets have relatively small atmospheres, composed of carbon dioxide, nitrogen, and oxygen.
Work Step by Step
Planets fall into two groups, based on location, size, and density. The terrestrial planets (Earth, Venus, Mercury, Mars) are dense and have relatively large cores, which are comprised of iron and nickel. Jovian planets have relatively small cores. Additionally, Jovian planets have very thick atmospheres, which are composed mainly of hydrogen and helium. Terrestrial planets have relatively small atmospheres, composed of carbon dioxide, nitrogen, and oxygen.
