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Step 1

The Fertilisers are washed into the lakes and rivers when it rains.

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Step 2

The increase of Nitrates and Phosphates in the water increases algae growth .

The Algae form a bloom over the water surface.

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Step 3

The sunlight can't reach the plants which then die as they can't Photosynthesise. 

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Step 4

Bacteria break down the dead plants. 

The Bacteria use up the oxygen in the water during respiration causing organisms to die.

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The End

Done :)

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