1001 Space Earth Earth Rocks and Minerals Landscape Sea Weather and Climate Natural Disasters Resources Nature History Human World Science and Technology

Choose a Page:How long has there been life in th...How much of the Earth is covered b...Why does seawater taste salty?Is the ocean floor flat?What causes waves?What is an iceberg?Are tidal waves caused by the tides?*What are ocean currents?*How has the ocean bed been measured?How does the sea affect the climate?How do coral reefs form?Are there currents at great depths?Why does the tide come in and go out? What are ocean currents? Ocean currents are movements of warm or cold seawater through water of a different temperature. Vertical currents happen because cold water sinks through warmer water. It then travels along the ocean beds as undersea currents. Surface currents are made by the wind blowing water ahead of it. Surface currents are created by the wind   Previous: Back Book: 1001 Section: Earth Chapter: Sea