Best answer: What three factors contribute to the dead zone in the waters off the Gulf of Mexico?

What Causes the Dead Zone? Heavy rains and melting snows washed massive amounts of nutrients—particularly nitrogen and phosphorus—from lawns, sewage treatment plants, farm land and other sources along the Mississippi River into the Gulf of Mexico.

What factors specifically contributed to the size of the 2017 Gulf of Mexico dead zone that made it so large?

A major factor contributing to the large dead zone this year is the abnormally high amount of spring rainfall in many parts of the Mississippi River watershed, which led to record high river flows and much larger nutrient loading to the Gulf of Mexico.

What is the most likely reason a dead zone in the Gulf of Mexico became smaller in 2012?

The primary culprit responsible for the growing size of the dead zone is an increasing supply of nitrogen dumped into the Gulf of Mexico from the Mississippi River.

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What are the causes of the yearly dead zones in the Gulf of Mexico?

Human activities in urban and agricultural areas throughout the Mississippi River watershed primarily cause the annual “dead zone.” Excess nutrients flow into the Gulf of Mexico and stimulate an overgrowth of algae, which die and decompose. The algae deplete oxygen as they sink to the bottom.

What created the dead zone in the Gulf of Mexico below the Mississippi River?

The annual Gulf of Mexico dead zone is primarily caused by excess nutrient pollution from human activities in urban and agricultural areas throughout the Mississippi River watershed.

Which of the following nutrients are responsible for the dead zone in the Gulf of Mexico?

Nutrient-rich runoff containing nitrogen and phosphorus from agricultural lands and sewage causes the summer dead zone in the Gulf of Mexico. These nutrients, in combination with sunlight and warm waters in the Gulf, trigger algal blooms.

Which of the following nutrients are responsible for the dead zone in the Gulf of Mexico Select all that apply?

What Causes the Dead Zone? The dead zone is caused by nutrient enrichment from the Mississippi River, particularly nitrogen and phosphorous.

When did the dead zone occur in Gulf of Mexico?

The Dead Zone was first recorded in the early 1970’s. It originally occurred every two to three years, but now occurs annually. In the summer of 1999 the Dead Zone reached its peak, encompassing 7,728 square miles.

What causes dead zones in the ocean?

Dead zones are generally caused by significant nutrient pollution, and are primarily a problem for bays, lakes and coastal waters since they receive excess nutrients from upstream sources. Excess nitrogen and phosphorus cause an overgrowth of algae in a short period of time, also called algae blooms.

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What is the dead zone in the Gulf?

Today, NOAA-supported scientists announced that this year’s Gulf of Mexico “dead zone”— an area of low to no oxygen that can kill fish and marine life — is approximately 6,334 square miles, or equivalent to more than four million acres of habitat potentially unavailable to fish and bottom species.

What is the main cause of hypoxia in the Gulf of Mexico?

The hypoxic zone in the Gulf of Mexico forms every summer and is a result of excess nutrients from the Mississippi/Atchafalaya River and seasonal stratification (layering) of waters in the Gulf. … This stratification prevents the mixing of oxygen-rich surface water with oxygen-poor water on the bottom of the Gulf.

How Dead zones are created?

Dead zones occur because of a process called eutrophication, which happens when a body of water gets too many nutrients, such as phosphorus and nitrogen. … Human activities are the main cause of these excess nutrients being washed into the ocean. For this reason, dead zones are often located near inhabited coastlines.