The main effect that the existence of seas and oceans on the earth's surface has on the planet is to act as a perfect climate regulator. During the day, the land (continent) tends to get hotter than the water, so it usually blows cold wind from the sea inland cooling the continental coastal areas by several degrees.
In the cold months and at night (in the absence of the sun), the earth cools more quickly than the entire body of water that surrounds it, acting as a thermostat and slowing down the temperature drop. This is the reason why cold months are always more benign in coastal areas than in interior areas, since the difference between maximum and minimum daily temperatures is less pronounced.
By this thermal exchange between the lands and the masses of water another very important agent in the Earth is generated: the climate. Water tends to evaporate and accumulate in the atmosphere in the form of water vapor. The humid air in movement, when encountering currents of different temperatures near the continent, generates different circulations of humid air giving rise to hurricanes and strong storms. But if it cools suddenly it will cause rain, hail or snow.
Rarely there is a very curious phenomenon that is the fall of fish or frogs in the form of rain. It is not magic, but it has its explanation when the water is dragged during the passage of a cyclone or hurricane, the tiny amphibious eggs or fish that were on its surface and tadpoles and fish of few days of life that continue their growth, are also dragged by the strong currents of air precipitating from the sky towards earth when the wind subsides, being unable to sustain them floating for longer.
Another effect that the sea has on the planet is to act as one of the main modeling agents of the reliefs. The sand itself of the beaches has been created by the incessant beating of the waves against the continent, destroying corals and animal remains (on white sand beaches) or rocks of different hardness (on golden and brown sand beaches of different shades) , leaving stones and rounded fragments.
In recent decades, numerous scientists have begun to develop gadgets and inventions to try to harness the energy of the incessant movement of the waves in order to obtain electricity from them, by installing in the water or near its surface, blades or other elements mobiles that are activated when each wave passes or by the existing air currents when the water evaporates, thus generating electricity. In the image you can see a case of these curious and modern marine power plants.
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