In the ocean movements we have: The Currents, The Tides and The Waves.
° Currents: Currents are large masses of water in the sea which movesteadily in definite directions. Surface currents are caused by periling winds and dragging the surface water along.Deep water currents are caused by differences oftemperature or salinity.
Water moves continuously through the ocean in huge rivers called currents. Currents may flow on the surface of the ocean, where they areshallow, or they may flow far below the surface, where they are deeper.
°Tides: Tides are the rising and falling of the sea. During high tide, the water is deeperand comes further onto the beach. Another name for high tide is flood tide. During low tide, the water is more shallow and does not come as far onto the beach.Another name for low tide is ebb tide.
Tides are created because the Earth and the moon are attracted to each other. The moon tries to pull at anything on the Earthto bring it closer. But, the Earth is able to hold onto everything except the water. Since the water is always moving, the Earth cannot hold onto it, and the moonis able to pull at it.
° Waves: When the wind blows across the water, it changes the
water's surface, first into ripples and then into waves. Storms
can makeenormous waves, particularly if the wind, blows in the same direction for any length of time.
As the wind blows, it "pushes" the ocean water ahead of it. The windactually transfers some of its energy into the water. The water is able to "gain" energy from the wind because of the friction between the wind and the water.