Water, Earth, Air, and Fire are the four essential elements for living. In the image the water covers most of the image and on our planet the 75 percent of the surface of the planet is water (does not make sense to call it Planet Earth, but should be called water planet). The air is also present in the image since that day was clear and had a lot of visibility although it was present a breeze that made the sea move capriciously. The earth here is present in two places, the sand of the island that ends and in the background another island visible from that point, and we lack the fire that is also present but not directly visible in the image (or yes), the Sun, since without it (which is actually a majestic ball of fire) we would have no image and there would only be darkness in that picture.
Picture taken in Formentera (Spain)