How does a farmer's fertilizer cause a dead zone in the ocean? The run off from the farm brings nitrogen to the
ocean. This causes the algae population to grow
a quickly. When they die the decomposers break
them down and use up all the oxygen in the water.
If there is no oxygen, nothing can live.
The run off from the farm brings nitrogen to the
ocean. This increases the population size of all
organisms. The presence of so many organisms,
blike fish, in a single area causes sharks and other
predators to come. When they consume all the
organisms in the area, it becomes known as a dead
zone.
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What is used on land has no interaction with what
happens in the ocean.