"because they will be anxious about the roar of the sea and its waves" or "and the loud noise of the sea and its rough movements will frighten them." This seems to refer to unusual storms or disasters involving the seas.
This can be stated in active form. Possible meanings are 1) the things in the sky like the sun, moon, and stars will not move in their normal way. AT: "God will shake the powerful things in the heavens" or 2) the powerful spirits in the heavens will be distressed. The first is recommended. (See: [[rc://en/ta/man/translate/figs-activepassive]])