The sea and the ocean are two very different bodies of water, and they are distinctly different in many ways.
First of all, in terms of scope, the ocean is a large area of saltwater on the earth, occupying 71% of the earth's surface, while the sea is only a part of the ocean, and the area is relatively small. Secondly, in terms of depth, the average depth of the ocean is about 3,700 meters, while the depth of the sea is relatively shallow, with an average depth of between a few hundred meters and several kilometers. In addition, in terms of salinity, oceans have a higher salinity because they have little exchange with the fresh water of rivers, whereas the salinity of the sea is lower because they have more exchange with rivers, freshwater lakes, etc.
In addition to these distinct physical characteristics, the sea and ocean also have different ecological environments and biomes. For example, in the ocean, there are various biological communities, such as plankton, fish, coral reefs, etc., which are formed by adapting to specific environments and conditions. In the sea, due to changes in environmental conditions, there are different ecosystems and biomes, such as tidal zones, mangroves, etc.
In addition, the sea and the ocean have different economic values. Due to their large area, deep depth and high salinity, oceans are of great significance to human economic activities. For example, the ocean is rich in fishery resources, including fish, shellfish, crustaceans, etc., which are important for human food**. In addition, the ocean is rich in oil and natural gas resources, which are also of great importance for human energy needs. In contrast, the economic value of the sea is relatively small, but they also have some ecological and economic value due to their unique ecological environment and biome.
In conclusion, although the sea and the ocean are both waters on Earth, they are distinctly different in many ways. Understanding these differences can help us better understand the Earth's aquatic ecosystems and how humans use and manage them.
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