The sea and ocean can't be compared in size. The earth's surface is divided into huge interconnected water bodies by the mainland, which are called oceans. The central part of the ocean is called ocean, and the marginal part is called sea. They communicate with each other and form a unified water body.
3. The island is bigger than the island, and the size of the island varies greatly, ranging from less than 1 square kilometer to tens of thousands of square kilometers. Usually, the larger one is called "island" and the smaller one is called "island".
Extended data:
The ocean is the central part of the ocean and the main body of the ocean. The total ocean area in the world accounts for about 89% of the ocean area.
The water depth of the ocean is generally above 3000 meters, and the deepest point can reach 10000 meters. The ocean is far from the land and is not affected by the land. The water temperature and salinity of the ocean have little change. Every ocean has its own unique ocean current and tidal system. The water in the ocean is blue and transparent, and there are few impurities in the water. There are five worlds, namely Pacific Ocean, Indian Ocean, Atlantic Ocean, Arctic Ocean and Antarctic Ocean.
The ocean at the edge of the ocean is an accessory part of the ocean. The area of the sea accounts for about 1 1% of the ocean, and the water depth of the sea is relatively shallow, with an average depth of several meters to 2-3 kilometers. The sea is close to the mainland and is influenced by the mainland, rivers, climate and seasons. The temperature, salinity, color and transparency of seawater are all affected by land and have obvious changes.