Answer
$\color{blue}Requires$ : 1- Inner planets and Outer planets
2-basic differences in size and composition
Work Step by Step
-The four $\boxed{inner\; planets}$: Mercury, Venus, Earth, and Mars.
-The four $\boxed{outer\; planets}$: Jupiter, Saturn, Uranus, and Neptune.
ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ
$\begin{array}{lll}
\\
\boxed{Description} &\boxed{
Inner\;planet} &\boxed{Outer\;planet} \\
\boxed{Size} & Small & Larger \;than\ the \; inner\; planet \\
\boxed{Composition} &Composed\; of \;heavy\; metals\; like\; Iron & Composed\; of \;a \ high\; percentage\\
&and\; nickel \;and \;the\; elements\;of \;which\; & of\; ices,\; water,\; carbon \\
& the\;rock\; forming\; minerals\; are\;composed& dioxide,\; ammonia, \;and \\
& \;silicon\;calcium,\; sodium,\;and\;so\;forth& methane\; as\; well \;as\; rocky \\
& formed\; metallic \;and\; rocky \; clumps & and\; metallic\; debris \\
& \; that \; orbited \; the\; Sun & \\
\end{array}$
