Where do you come from?

The other day, my friend Elie had a classmate ask her "Do you believe in Adam and Eve?" Of course, she said "Yeah. Why?" The classmate responded "Then how do you explain black people?" Confused by this stateme nt, my friend asked me to help her find an answer (she's been a Christ follower for 3 years, but doesn't know the Old Testament stories very well). My first reaction was laughing. If this isn't proof that Christianity has been "white-washed" with the blonde hair blue eyed baby Jesus, then I don't know what is. 

(If you have a reason, post it in your comment. I'd love to see what everyone came up with). 

Had it been me who was asked that question, I would have smarted off with "Technically Adam and Eve were most likely Middle Eastern, so where did, not only the blacks, but the whites, Indians, Asian, Eskimos...come from?" But then I came up with a slightly scientific answer--being closer to the sun or out in the sun more gives you a darker pigment. If you look at where each ethnicity comes from, you can explain it like that, but then I had to think of a biblical answer....Tower of Babel!!! If you don't know this story, it is one of my favorite stories in the Bible (find it here!) Pretty much, the people got cocky and thought they could be better than God, so God, being the brilliant deity he is, mixed the people so much they could even relate to each other, much less communicate. Thus he created language, culture, and color for all sorts of ethnicities. Would you have answered it differently? Any other explanations?