* Rock: This includes minerals like silicates (like quartz and feldspar), iron, and magnesium. They are denser than the outer planets.
* Metals: Iron and nickel are common in the core of these planets.
Here's a breakdown of the inner planets and their composition:
* Mercury: Mostly iron and nickel core, with a thin silicate mantle and crust.
* Venus: Similar to Earth, with a thick silicate mantle and crust, but with a very dense and hot core.
* Earth: Iron-nickel core, silicate mantle, and a thin crust.
* Mars: Smaller and less dense than Earth, with a smaller core and a thin atmosphere.
The outer planets, like Jupiter and Saturn, are gas giants and are primarily composed of hydrogen and helium.
