Which of the following contributes most to the hypoxic dead zone in the Gulf of Mexico?

The annually recurring Gulf of Mexico hypoxic zone is primarily caused by excess nutrient pollution from human activities, such as urbanization and agriculture, occurring throughout the Mississippi River watershed.

What is causing the dead zone in the Gulf of Mexico?

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.

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.

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What has caused the hypoxic dead zone?

Dead zones are low-oxygen, or hypoxic, areas in the world’s oceans and lakes. … That is why these areas are called dead zones. 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.

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.

What is the hypoxic zone in the Gulf of Mexico?

The hypoxic zone in the northern Gulf of Mexico is an area along the Louisiana-Texas coast, where water near the bottom of the Gulf contains less than two parts per million of dissolved oxygen, causing a condition referred to as hypoxia. Each summer, the size of the hypoxic zone is measured.

What are the causes of dead zones?

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.

What activities cause hypoxia?

Hypoxia occurs most often, however, as a consequence of human-induced factors, especially nutrient pollution (also known as eutrophication). The causes of nutrient pollution, specifically of nitrogen and phosphorus nutrients, include agricultural runoff, fossil-fuel burning, and wastewater treatment effluent.

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What is the reason for hypoxic coastal lines?

Hypoxic conditions occur naturally in open-ocean and coastal subsurface waters from a combination of weak ventilation, warming, and organic matter degradation—features that are all exacerbated by climate warming and coastal nutrient eutrophication.

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.

Which of the following would most likely cause a hypoxic dead zone in a body of water adjacent to an agricultural field?

The cause of such “hypoxic” (lacking oxygen) conditions is usually eutrophication, an increase in chemical nutrients in the water, leading to excessive blooms of algae that deplete underwater oxygen levels.

What has caused the hypoxic dead zone to form off the coast of the Gulf states quizlet?

What has caused the hypoxic dead zone to form off the coast of the Gulf states? Fertilizers promote the growth of algae. When they die and decompose, oxygen is depleted in the Gulf of Mexico.

When did the Gulf of Mexico dead zone happen?

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.

Why is the Arabian Sea a dead zone?

The oxygen-saturated waters of the Arabian Gulf sink to intermediate depths (200‐300m) ventilating the world’s thickest Oxygen Minimum Zone (OMZ). … The warming of the Arabian Gulf is predicted to continue in the future, causing the intensification of the dead zone due to its lack of ventilation.

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