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Oceanography

Explore how oceans formed through continental drift, the three major subdivisions, ocean water composition, surface currents, and the unique features of the ocean floor.

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Oceanography

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  1. Oceanography Courtney Varvel & Marguerite Blum

  2. How did Oceans Form? • CONTINENTAL DRIFTPangaea broke up with part of the continent drifting north and part south. The continents continue to drift. Today the oceans are still changing shape; the Atlantic Ocean gets wider by a few inches each year.

  3. Oceans • Oceans cover ¾ of the earth’s surface • The three major subdivisions of the world ocean are the Atlantic Ocean, the Pacific Ocean, and the Indian Ocean, which are conventionally bounded by the continental masses or by ocean ridges or currents

  4. Ocean water • Seawater is a dilute solution of several salts derived from weathering and erosion of continental rocks.

  5. Waves • The surface currents of the ocean are characterized by large gyres, or currents that are kept in motion by prevailing winds, but the direction of which is altered by the rotation of the earth

  6. The Ocean Floor • The bedrock of ocean floors has many features.

  7. Facts about oceans • Area: about 140 million square miles (362 million sq km), ore nearly 71% of the Earth's surface. • Deepest point: 36,198 feet (11,033 m) in the Mariana Trench in the western Pacific.

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