Iron, Magnesium, silicate rocks, sodium potassium aluminium silicate rocks, and water
According to Wikipedia:
http://en.wikipedia.org/wiki/Structure_of_the_Earth
"The crust ranges from 5 to 70 km in depth. The thin parts are oceanic crust composed of dense (mafic) iron magnesium silicate rocks and underlie the ocean basins. The thicker crust is continental crust, which is less dense and composed of (felsic) sodium potassium aluminium silicate rocks. The crust-mantle boundary occurs as two physically different events."
According to Wikipedia:
http://en.wikipedia.org/wiki/Structure_of_the_Earthhttp://en.wikipedia.org/wiki/Structure_of_the_Earth
"The interior of the Earth, similar to the other terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core."