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Upwelling is nutrient rich water which is wind driven and cooler moved toward the ocean's surface replacing nutrient starved, warmer surface water. Look here for more information:
http://answers.ask.com/Science/Nature/what_is_upwe...
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Upwelling of water is caused by the wind which blows toward the equator. This cause the water to turn west and away from the coast. This in turn calls the water to rise or up well
http://answers.ask.com/Science/Nature/what_causes_...
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Large amounts of dissolved nutrients are brought to the ocean's surface.
http://wiki.answers.com/Q/What_is_a_benefit_of_the...
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Along coasts, this is caused by winds blowing at a right angle to the shoreline. The surface water is pushed away, bringing deep, cold water (rich in nutrients) to the surface.
http://wiki.answers.com/Q/What_causes_upwelling_in...
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