All Oceans would be salt because when water evaporates it leaves the salt behind and the oceans continue to become more salty. At that rate the oceans would be entirely salt. And God's word being closely analyzed is better than the guess of other scientists. Christian researchers just found out how old everyone was using the Bible and that's how we got a number. And we can know that the Bible is true because older versions were found that were identical to Bibles in use today.