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Hypoxia
Depleted oxygen levels; creates dead zones
Eutrophication
When a body of water acquires a high concentration of nutrients promoting excessive algae growth
Sources of excess nutrients
Agricultural runoff, urban rainwater runoff, soil erosion, animal waste, sewage
Algae blooms
Come about due to too many nutrients, especially nitrogen and phosphorus
Sedimentation
Shallowing water bodies occurs as sediment gets in the waterways. This causes the temperature to greatly increase, leading to more algae blooms. Additionally, sediment can carry excess nutrients.