Could any of you more scientifically minded folk explain to me what would cause a world to potentially cease having waves? Or not have them in the first place? I'm aware the moon is the cause of them, but is it solely the moon, or are there other factors involved? What would be a creative way to explain how the ocean no longer is the life-filled cesspool it once was? In my story, the sea is little more than dead, and ashen thus it's very difficult to travel by water. Thoughts or Advice?