the similar rock is asteroid.
astroids
granite
They were made of dust, not rock
there are 9 planets
The other planets are not similar to dwarf planets.
astroids
An Astroid
Soil (no rocks)
Chondritic meteorite.
There are lots of different types of rocks that form the planets.
granite
All inner planets are made of rock. (Earth, Mars, Venus, and Mercury)
Obviously they formed in the same manner...Gravity is Gravity!
They were made of dust, not rock
The four inner planets are all made of rock or are rock based but the four outer planets are all made of gas or gas based.
It is a cosmic body, formed from a cloud of dust and gases.
Inner planets are rock with minerals similar to those on Earth