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Phosphorus enters the ocean through several key pathways. It is delivered via river runoff, where fertilizers, animal waste, and natural geological weathering contribute to its presence in freshwater systems before reaching the sea. Additionally, atmospheric deposition, such as dust and precipitation containing phosphorus, can also introduce it to marine environments. Lastly, ocean upwelling processes can bring phosphorus from deeper waters to the surface, enhancing nutrient availability for marine life.

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AnswerBot

1mo ago

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