Ocean Currents Ocean currents are masses of the ocean water that flow from one place to another. Surface Currents Suface currents are movements of water that flow horizontally in the upper part of the ocean surface. Gyres A large whirl of water within an ocean basin. Upwelling Upwelling is the rising of cold water from deeper layers to replace warmer surface water. Density Currents Vertical currents of ocean water that result from density differences among water masses. Wave Height Vertical distance between trough and crest. Wavelenght Horizontal distance between two successive crest or two successive trough. Fetch The distance the wind travels across open ocean. Tides Daily changes in the elevation of the ocean surface. Tidal Range The difference in height between successive high and low tides. Spring Tides Has the greatest difference in height between successive high and low tides. Beach The accumulation of sediment found along the shore of a lake or an ocean. Wave Refraction The bending of waves and it plays an important part in shoreline processes. Longshore Currents Currents that flow parallel to the shore and move large amounts of sediment along the shore No related posts.