There are warships on the sea, and there are sailing ships on the sea. Imitate sentences: There are warships and sailing ships on the sea.
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Ocean, an earth science term, is the general name for the most extensive body of water on the earth. The surface of the earth is divided by continents into vast water bodies connected with each other called oceans. The central part of the ocean is called an ocean, and the edge part is called a sea. They communicate with each other to form a unified body of water. The total area of ??the earth's oceans is about 360 million square kilometers, accounting for about 71% of the earth's surface area, and the average water depth is about 3,795 meters. The ocean contains more than 1.35 billion cubic kilometers of water, accounting for about 97% of the total water on the earth.
Only 2% can be used for human drinking. The four main oceans of the earth are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, and the Arctic Ocean. Most of them are bounded by land and seabed terrain lines. Today, only 5% of the seabed has been explored by humans, and 95% of the seabed is unknown. The ocean covers more than 70% of the earth's surface and is the main driver of weather and climate. A slight fluctuation in ocean temperature may cause drastic changes in weather and climate around the world.
Because the Earth’s ocean area (approximately 360 million square kilometers) is much larger than the land area, some people call the Earth a “big water ball.” The Pacific, Atlantic and Indian Oceans account for 46%, 24% and 20% of the Earth's total ocean area respectively. Important marginal seas are mostly found in the Northern Hemisphere, and they are partly surrounded by continents or islands. The largest ones are the Arctic Ocean and its offshore waters, the European Mediterranean, the Caribbean and the Red Sea and their nearby waters, the Bering Sea, the Yellow Sea, the East China Sea and the Sea of ??Japan.
Ocean scenery Seawater temperature is a physical quantity that reflects the hot and cold conditions of seawater. The water temperature of the world's oceans generally varies between -2°C and 30°C, with the area where the annual average water temperature exceeds 20°C accounting for more than half of the entire ocean area. Seawater temperature has cyclic and irregular changes in days, months, years, and years, which mainly depend on the ocean heat budget and its time changes.
Generally speaking, factors that affect ocean surface water temperature include tides, solar radiation, coastal topography, meteorology, ocean currents, etc. Direct observation shows that the daily variation of seawater temperature is very small, the changing water depth ranges from 0 to 30 meters, and the annual variation can reach a water depth of about 350 meters.