Science has recently discovered this in the 20th century but this natural phenomena was mentioned 1,400 years ago in the Quran ''Or (they are) like Darkness within an unfathomable sea which is covered by Waves, upon which are Waves, over which are clouds'' This verse mentions that the deep waters of seas and oceans are covered by waves and above these waves are other waves.
It is clear that the second set of waves are the surface waves that we see because the verse mentions that about the second waves there are clouds. The internal waves cover the deep waters of seas and oceans because the deep waters have a higher density than the waters above them.
How could a man living fourteen hundred years ago in desert know this? and why would he mention this? where did this knowledge come from? was he a scientist? did he just guess? how could an illiterate man who was a shepherd come up with a book in a society where 95% of the people were illiterate? historians to this day can't explain how desert dwellers defeated the biggest empires of that time like the Romans and the Persians. How come this man is still followed to this day by millions? How come the book he brought is memorized by millions by hear?
Allah says in the Quran: '' Or do they say, 'He invented it' Say, Then bring ten verses like it that have been invented and call upon (for assistance) whomever you can besides Allah, if you should be truthful''