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In the Quran there is a barrier between two seas with different salinities. Skeptics claim that whoever wrote the Quran made a mistake; they will mix to a new average salinity. Today scientists confirm that halocline separates two bodies of water with different salinities.
The difference in density, temperature, salinity and CO2 concentrations in seas cause water to separate into layers. This phenomenon is called water stratification:
Stratification
Water stratification is when water masses with different properties - salinity (halocline), oxygenation (chemocline), density (pycnocline), temperature (thermocline) - form layers that act as barriers to water mixing which could lead to anoxia or euxinia. These layers are normally arranged according to density, with the least dense water masses sitting above the more dense layers.
Wikipedia, Stratification, 2018
The difference in salinity is one of the factors that separate water into layers. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered:
And it is He who merged the two seas; this one fresh and pure, and that one salty and bitter; and He placed between them a barrier and a boundary.
٥٣ وَهُوَ الَّذِي مَرَجَ الْبَحْرَيْنِ هَٰذَا عَذْبٌ فُرَاتٌ وَهَٰذَا مِلْحٌ أُجَاجٌ وَجَعَلَ بَيْنَهُمَا بَرْزَخًا وَحِجْرًا مَحْجُورًا
The Quran correctly described sea water separation caused by difference in salinity.
In the Arctic oceanographers discovered a layer 150m thick that acts as a barrier between the freshwater above it and the salty water below it. This barrier is called halocline.
Halocline
In oceanography, a halocline is a subtype of chemocline, caused by a strong vertical salinity gradient within a body of water. Because salinity (in concert with temperature) affects the density of seawater, it can play a role in its vertical stratification.
A halocline separates water layers with different salinities. This was only known recently, however this was portrayed in the Quran 1400 years before it was discovered. The Quran described two seas with different salinities and said there is a barrier between them. Today we know this barrier is called halocline.
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