by 
Violet
ANSWERS: 2
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Upwelling brings colder denser water to the surface. Colder, denser water holds more nutrients than warmer, less dense water.
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The bodies of the living beings that die in the ocean sink to the bottom. After this organic debris reaches the ocean floor, bacteria and scavengers transform much of it into nutritious inorganic salts of nitrogen and phosphorus. When cold polar waters clash with warm surface currents during churning, the nutritious matter is brought up to the ocean surface leading to population explosion among microscopic marine plants. The region of Cold Current becomes a great breeding ground for fishes that feed on the vast plant life. There is a consequent population explosion among birds which eat fishes of this region. The wealth of food on these fishing regions is difficult to comprehend. The Canaries Current region off West Africa is bountiful enough that, in modern times, it attracts Japanese fishing ships from halfway round the world.
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