What happens in a phobic part of a body of water

Where aquaphobia involves a fear of water itself, thalassophobia centers on bodies of water that seem vast, dark, deep, and dangerous. People are not afraid of the water so much as they are afraid of what lurks beneath its surface. The term thalassophobia steps from the Greek thalassa ("the sea") and phobos ("fear").

Explanation:

this is the zone of a body of water that light can penetrate and photosynthesis can still occur

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