,The metoritc rocks are parts of some planets that had been destroyed in the past
Then some of these pieces fell and still is falling on the planets including our Earth
Such rocks which had been parts of some destroyed planets, some of them fell on our Earth forming the mountains of our earth and the rest of the planets
Moreover they carried the germ of life to these planets from the old destroyed planets that ha
been inhabited with all forms of life

http://quran-ayat.com/universe/new_p...htm#Meteorites