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Rain Water washes the fertilisers and pesticides from the agricultural land into the sea.
The run off is warmer than the sea so forms a barrier layer restricting light and oxygen to the bottom.The nitrates cause a sudden growth causing algal growth.
The barrier layer blocks light and oxygen from the bottom of the water so plants die
When the algae bloom dies it sinks to the bottom and is decomposed by bacteria,which uses up a lot of the dissolved creating hypoxia.
Fish Suffocate due to the hypoxic water because they cant breathe
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