The Holy Quran on Deep Seas and Internal Waves
Allah has said in the Quran:“Or (the unbelievers’ state) is like the darkness in a deep sea. It is covered by waves, above which are waves, above which are clouds. Darknesses, one above another. If a man stretches out his hand, he cannot see it....” (Quran 24:40)
This verse describes the darkness found on deep seas and oceans, where if someone stretches out his hand, he is not able to see it. The darkness in deep seas and oceans can be found around a depth of 200 meters and below. Only at that depth, there is almost no light (see figure 1). Under a depth of 1000 meters there is absolutely no light at all. Human beings aren't able to dive much more than forty meters without the assistance of submarines or special devices. Human beings cannot endure unaided in the deep dark a portion of the oceans, such as at a level of 200 meters.
Figure 1: Between 3 and 30 percent of the sunlight is mirrored at the sea surface. Subsequently almost all the seven colors of the light range are absorbed one after an additional in the first 200 meters, except for the blue light. (Oceans, Elder and Pernetta, p. 27.)
Researchers and scientists have recently uncovered this darkness by means of specialized equipment and submarines that need enabled them to read the depths of the seas.
We may also understand through the following sentences in the earlier verse, “...in a deep-sea. It is included in waves, above that are waves, above that are clouds....”, that the deep waters of seas and also oceans are included in waves, and above these swells are other waves. It is obvious that the second set of surf are the area waves that we see, considering that the verse mentions that on top of the second waves there are clouds. Exactly what about the first waves? Researchers have recently found out that there are internal waves which kind of “occur on density interfaces between levels of different densities.” (see figure 2).
Figure 2: Internal waves at user interface between two layers of water of various densities. One is heavy (the lower one), the other the first is less dense (the upper one). (Oceanography, Gross, p. 204.)
The internal surf cover the deep waters of seas and oceans due to the fact deep waters have a higher density as compared to waters above them. Internal waves act like surface waves.
They may be able also break, just like surface waves. Internal waves may not be seen by the human eye, but they can be detected by studying temperatures or salinity modifications at a given location.
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