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KeepItBangtan
I would personally say volcanoes, as the magma rises and cools down and hardens die to the coldness of the sea. Hope this helps :)

Answer:

It is waves.

Explanation: It is either waves or tectonic plates, i'm pretty sure it is waves tho. I had this on my gradpoint and pretty sure it is waves. I forsure know it is not volcanoes. THX !!! (: show some love, let me know if it is tectonic plates.