surface currents - movement of the surface water of the sea in a constant direction, prevailing wind - the direction from which the wind always blows, phytoplankton - small organisms in the sea that can make thier own food, euphotic zone - the top 200m of seawater in which photosynthesis can happen, upwelling - areas where minerals at the ocean floor are brought to the surface by currents, over-fishing - when the number of fish that is caught is greater than the rate at which the fish reproduce, anchovy - a small fish with a strong, salty taste, equator  - an imaginary line drawn around the middle of the earth,

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