As Noah's descendants migrated around the world after Babel, each language group developed distinct features based on environment and genetic variation. Those with a genetic makeup suitable to their new environment survived to reproduce. Over time, certain traits (such as dark skin color for those closer to the equator) dominated. Genesis alone offers a reasonable answer to the origin of the races and languages.

Genesis 11  

The Bible is a History book, not a Science book, but it is remarkable that where the Bible touches on Science, not only is it correct, but the writer could not have possibly known what he was talking about! How did the writer know these scientific facts? It must have been revealed to him by the Creator of the universe.

The Bible is unlike ANY book ever written. It is, in fact, the Word of God.

Source: Eternal Productions