The term "ocean" typically refers to the vast bodies of saltwater that cover significant portions of the Earth's surface. There are five primary oceans: the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern (or Antarctic) Ocean, and Arctic Ocean. Oceans play a crucial role in regulating the Earth's climate, supporting diverse ecosystems, and facilitating global trade and transportation. Oceans are home to a wide range of marine life, from tiny plankton to massive whales.
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The connected bodies of saline water covering most of Earth's surface. Physical oceanography studies their circulation, stratification, waves and heat transport.