| 1. | "Their migration moves north, then south, tending to follow the surface currents.
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| 2. | Atmospheric winds and pressure differences also produces surface currents, waves and seiches.
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| 3. | A "'subsurface current "'is an oceanic current that runs beneath surface currents.
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| 4. | Thinner ice in areas with swift surface currents are a significant hazard.
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| 5. | Surface currents are generally restricted to the upper 400 meters of the ocean.
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| 6. | Ingraham is constantly refining the ocean-simulating computer program, or Ocean Surface Current Simulator.
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| 7. | Surface currents make up about 10 % of all the water in the ocean.
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| 8. | The wind and waves create surface currents ( designated as ?drift currents ?).
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| 9. | If it continues long enough, the surface current also reverses, creating treacherous going for mariners.
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| 10. | The currents often pinch to filamentary or surface currents.
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