Hypothesis of Creation binary

The hypothesis of the binary Creation supposes the formation at the same time both of the Earth and of the Moon, from the same material and in the same zone of the solar System. In favour of this theory there is the radioactive datación of the lunar rocks brought to our planet for the diverse spatial missions, which date between 4.500 and 4.600 million years the lunar, age approximately the age of the Earth.

Since disadvantage we have that, if the two were created in the same place and with the same matter: how is it possible that both possess chemical so different composition and a density?. In the Moon it abounds the titanium and the exotic compounds, not so abundant elements in our planet at least in the most superficial zone.