Dark watersThe dark color of the seawater could be caused by many factors.
From the perspective of light absorption and scattering, seawater absorbs and scatter light of different frequencies differently. When there were more substances in the seawater, it would greatly affect the transmission of light. If there were a large number of suspended particles, algae, or other organisms in the seawater, these substances would absorb and scatter light, making it difficult for light to penetrate the seawater, causing the seawater to look dark. For example, in some heavily polluted waters, a large amount of pollution would block light and make the water look darker.
In terms of water depth, light needed to penetrate a long distance in extremely deep waters. As the depth increased, light was gradually absorbed. After a certain depth, almost no light could reach, so the deep waters looked dark.
In terms of ecological factors, if there was a special biological phenomenon, such as a large number of creatures gathering and producing special absorption or reflection of light, it might also make the sea look dark.
In some special geographical environments, such as the seabed topography that made it difficult for light to reach or the slow flow of seawater and poor exchange, the seawater might also appear dark.
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