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Description

A lake is a body of water that is relatively static in the inland depression and has a certain area and is not directly connected to the ocean. There are approximately 117 million lakes in the world, covering nearly 5 million square kilometers of the Earth.

From the perspective of earth history, the lake is only a temporary water body, which will be slowly landed by sedimentation; except for a few ancient lakes, such as Lake Baikal, most lakes can only be traced back to the Pleistocene ice age. .
Lakes with rivers flowing out are usually freshwater lakes. Lakes without rivers are almost lagoons, called inflow lakes (or inland lakes), but there are also a few like Lake Chad (because of artificial flow), which is still the inflow lake of freshwater lakes.

According to different water temperature and nutrient content, lakes can be divided into three categories: “poor,” “medium,” and “rich”. The poor lakes have low water temperatures and low nutrient content, while the lakes are the opposite. However, the generalization of the lake is between the two; the transformation of the lake from poor to superior is a natural process that occurs regardless of human intervention, but human disturbance significantly accelerates the process of lake eutrophication. The final stage of lake eutrophication will eventually become a swamp due to the deposition of sludge.