The Sea mentioned in the Quran
He has let loose the two seas, converging together, with a barrier between them they do not break through. (Qur’an, 55:19-20)
This property of the seas, that is, that they meet and yet do not intermix, has only very recently been discovered by oceanographers. Because of the physical force called “surface tension,” the waters of neighbouring seas do not mix. Caused by the difference in the density of their waters, surface tension prevents them from mingling with one another, just as if a thin wall were between them.
It is interesting that, during a period when there was little knowledge of physics, and of surface tension, or oceanography, this truth was revealed in the Qur’an.
There are large waves, strong currents, and tides in the Mediterranean Sea and the Atlantic Ocean. Mediterranean Sea water enters the Atlantic by Gibraltar. But their temperature, salinity, and densities do not change, because of the barrier that separates them.
DARKNESS IN THE SEAS AND INTERNAL WAVES
Or [the unbelievers’ state] are like the darkness of a fathomless sea which is covered by waves above which are waves above which are clouds, layers of darkness, one upon the other. If he puts out his hand, he can scarcely see it. Those Allah gives no light to, they have no light. (Qur’an, 24:40)
In deep seas and oceans, the darkness is found at a depth of 200 meters and deeper. At this depth, there is almost no light, and below a depth of 1,000 meters there is no light at all.
Today, we know about the general formation of the sea, the characteristics of the living things in it, its salinity, as well as the amount of water it contains, and its surface area and depth. Submarines and special equipment, developed with modern technology, have enabled scientists to obtain such information.
Human beings are not able to dive to a depth of more than 70 meters without the aid of special equipment. They cannot survive unaided in the dark depths of the oceans, such as at a depth of 200 meters. For these reasons, scientists have only recently been able to discover detailed information about the seas. However, that the depth of the sea is dark was revealed in the Qur’an 1,400 years ago. It is certainly one of the miracles of the Qur’an that such information was given at a time where no equipment to enable man to dive into the depths of the oceans was available.
In addition, the statement in Surat an-Nur 40 “…like the darkness of a fathomless sea which is covered by waves above which are waves above which are clouds…” draws our attention to another miracle of the Qur’an.
Scientists have only recently discovered that there are sub-surface waves, which “occur on density interfaces between layers of different densities.” These internal waves cover the deep waters of seas and oceans because deep water has a higher density than the water above it. Internal waves act like surface waves. They can break, just like surface waves. Internal waves cannot be discerned by the human eye, but they can be detected by studying temperature or salinity changes at a given location.
The statements in the Qur’an run parallel precisely the above explanation. Certainly, this fact, which scientists has discovered very recently, shows once again that the Qur’an is the word of Allah.