Mercury Venus Earth Mars

Terrestrial planets

1.Scientist believe that mercury has a interior similar to Earth. It has a large core of liquid metal surrounded by a hot solid rock outer layer.
2.Venus is made up of a iron core and a rocky mantel. It's atmosphere is made up of carbon dioxide (96%) and nitrogen (3%), with small amounts of other gases.
3. Earths core is made of nickel and iron. Earths mantel is made up of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals. Earths surface is a rocky layer called the crust , is made of mostly oxygen.
4. Mars has a core that is mainly made of Ron and sulfur. Then the mantel is made of silicates. Then the crust is made of basalt, and iron (which explains it's red color.)