started of as a rock,kept getting bigger,first small rocks,dinosaurs later,once uninhabitable,once a molten planet,melted lava,minerals collided,thin crust,formed from the sun,melted and cooled,lava and rock,pangaea was formed,started from a rock,cooling from inside,forming and melting,billions years old,rocks got smashed,gravity formed it,was made from rocks.,started from rocks,supercontinet,cooling inside out,continental drift,30 million years,its almost a pheare.,its almost a sphere,all of them,