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Answer:

Oceans upwelling decreases, reducing levels of nutrient-rich water

Explanation:

Typically, trade winds blow from east to west in the Pacific pushing warm surface ocean waters towards Asia. This causes upwelling of cold ocean currents from the depths of the oceans on the west coast of South America bringing up nutrients from the depths.

During Elnino, however, these trade winds weaken, and predominant winds blow eastwards, reducing this upwelling of colder deeper waters.

When weather conditions are disrupted by El Nino then Oceans upwelling decreases and levels of nutrient-rich water is reduced.

Further Explanation:

The Pacific Ocean is the Earth's largest and deepest Oceanic division that stretches from Arctic Ocean towards North to Southern Ocean towards South. It is also bounded Australia and Asia in the Western side and America on the eastern side. It covers consists of the Earth's 46% total surface water. The imaginary line Equator that splits the Earth Into two hemispheres passes through it centrally and divides the Earth into the Southern hemisphere and Northern Hemisphere.

Warm current in the Pacific Ocean is caused due to change in the temperature of the water that is called El Nino. It is related to the belt of warm ocean water developed in the central and eastern-central equatorial Pacific that includes the area of South America's Pacific coast.  El Nino is conveyed by western Pacific high air pressure and eastern Pacific low air pressure. The countries that are under the developing stage get most affected by it, particularly those countries that depend on fishing and agriculture.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Ecology

Keywords:

El Nino, pressure, pacific, air pressure, fishing, agriculture, southern hemisphere, northern hemisphere, split, earth, south, Australia.