Eutrphication

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Eutrphication
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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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