Final answer:
Coastal upwelling along the California coast is a result of winds moving water away from the coastline, replacing surface water with nutrient-rich deeper water, leading to high productivity.
Explanation:
Coastal upwelling occurs along coasts when winds move water away from the coastline, leading to the replacement of surface water with nutrient-rich deeper water. This process results in high productivity, especially notable along the coast of California due to the prevailing winds and Ekman transport.
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