Except that fresh water does mix with salt water.There is a sura (chapter) in the quran that has a verse speaking about the point where the river and sea meet!
According t the quran (again more than 1400 years ago) the river water does not mix with the sea water, further more there is a barrier between them! Yet in recent days according to researches. when river water meets the salty sea water they do not mix they go back to their own waters and at the point where they meet there is a barries of water that is less salty than the sea water and not fresh as the river water, which does not allow these waters to mix!
Man, you wanna tell me that a Man living in the desert 1400 years ago, made this claim when at these days science was very poor!
When fresh water meets salt water, fresh water being lighter floats on top, but waves, winds and tides mixes them. If this didn't happen then the oceans would be covered by a layer of fresh water.
All of the elements that make the earth came from space including iron. Earth formed from a cloud of dust along with the sun and other planets.The sura or chapter is 25 and verse no: 53. by the way check this websit out for more miracles of the quran: http://www.scienceislam.com/index.php
another one that also surprised me, did u know that iron on this earth is not from the earth itself, it is from outside earth from other stars or planets in space that has exploded and has reached earth?
Another verse in the quran talks about the iron being sent down to earth.
Iron meteorites were an early source of Iron.
No miracles here.