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Nutrient load up-Excessive nutrients from fertilisers are floated from the land in the rivers or lakes by rainwater.
Farmers use fertilisers on their crops and when the fertilisers are washed through the soil the process is called leaching.
Plants flourish-These pollutants cause aquatic plant growth.
Algae,duckweed and other plants
Algae blooms leaving oxygen depleted:algae blooms preventing sunlight reaching other plants.
Oxygen in the water is depleted and the plants die.
Dead plants are broken down by bacteria decomposers using up even more oxygen
Oxygen levels reach a point where no life is possible which means organisms such as fish die
Death of the ecosystem
Decomposition further depletes oxygen
Then the process repeats itself
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