Quran On Internal Waves
Seas have internal waves just like they have surface waves.
Internal waves are gravity waves that oscillate within a fluid medium, rather than on its surface. To exist, the fluid must be stratified: the density must decrease continuously or discontinuously with depth/height due to changes, for example, in temperature and/or salinity.
The internal waves travel more slowly than surface waves of similar amplitude because the difference in density between two water masses is much less than it is between air and water. The internal waves typically have wavelengths from hundreds of meters to tens of kilometers and have periods from several minutes to several hours. Internal waves are trapped in the pycnocline of stratified oceans.
It is easier for internal waves to travel between layers of different densities at the pycnocline. In open oceans this is much deeper than the photic zone. This means that those waves travel in complete darkness.
The Quran talked about those internal waves long before it was discovered:
(Quran 24.40) Or like the depths of darkness in a vast deep ocean, overwhelmed with waves topped by waves, topped by clouds: depths of darkness, one above another: if a man stretches out his hand, he will not see it! If Allah does not give light to a person he will not have light!
Shorelines
Global warming is causing the ice at the poles to melt which in turn causes the level of world oceans to rise, consequently all shores recede. This is portrayed in the Quran:
(Quran 13.41) Do they not see how We deal with the land (الْأَرْضَ), diminishing it at its edges? Allah judges; and nothing can hold back His judgment. And He is quick to settle accounts.
In Arabic Ard الْأَرْضَ means "Earth" and it also means "Land". Shores are edges of the land. Land is diminishing at its edges because of rising sea waters.
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