what is the scientific explanation of the formation of earth's layers?

Answer 1

Lots of theories!

http://en.wikipedia.org/wiki/Structure_of_the_Earth
and
http://www.google.com/search?hl=en&as_q=scientific+explanation+of+the+formation+of+earth%27s+layers&as_epq=&as_oq=&as_eq=&num=10&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images

Answer 2

Thanks so much!