The Miracles of Al Qur’an and Modern Science

It is true that Al Qur’an is a miracle from God. How come? Many Al Qur’an verses that were sent down in 7^th century where science was not developed yet (many people thought the earth is flat and the Sun revolves arount the Earth) fit with the Modern Science.

For example look at the verses below:

Heaven and Earth used to be one

“Have not those who disbelieve known that the heavens and the earth were of one piece, then We parted them, and We made every living thing of water? Will they not then believe?” [Al Anbiyaa:30]