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One of the main causes of the build of nitrates and phosphates is fertalizer
Another cause can be animal manure and sewers from humans.
Eutrophication occurs when there is a build up of excess nutrients in a body of water.
When it rains stuff tends to soften so the animal manure and fertilizer will soften and begin to wash away
Manure from sewers may also get into rivers
The rain causes run off which may go into a river that leads to another body of water.
when the runoff from the farms and sewers gets into this water this causes and unnecessary amount of nutrients
The extra nutrients cause algae to grow into large algal blooms.
The algal blooms become large and begin to sit at the top of the water
Hypoxic levels is when then DO reaches 2mg/L or less but higher than 0
The algal blooms begins to block the sunlight from entering the ocean
Anoxic is when the DO gets to 0mg/L
This causes hypoxic and anoxic levels of dissolved oxygen
The lack of oxygen causes animals aquatic life to die off and leaving some to try to escape the dead zone
The algal blooms eventually die off as well
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