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