Feb 3, 2022
Dead Zones
-- dead zone = an area of water where oxygen levels have become very low
-- hypoxic = where oxygen is present in a very low concentration
-- dead zones have insufficient oxygen for respiration
-- organisms die or must move
-- occur near coastlines where there are high levels of nutrients washing off agricultural land
-- first one reported in the early 20th century
-- sources: -- chemical fertilizers -- sewage waste
-- can form naturally if nutrients are brought up from deep water by wind or current
-- Gulf of Mexico dead zone is the second largest
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