Ponds%20and%20rivers%20are%20naturally%20low%20in%20minerals

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Ponds and rivers are naturally low in minerals
If fertiliser washes from farmland
Water plants grow slowly
Water plants grow quickly
Plants growing below the surface
Dont get enough light and die
Dead matter
Use up oxygen from the water
Increase in numbers
Bacteria and other microbes
Animals that cannot tolerate it
Carry out aerobic respiration
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