Oceans are large bodies of saltwater. There are 5 oceans in the world-- Atlantic, Pacific, Indian, Arctic, and Southern. Oceans take up two-thirds of the surface of the Earth. Ocean tides are caused by the moon's gravitational pull.
"Waves in pacifica 1" by Brocken Inaglory - Own work. Licensed under GFDL via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Waves_in_pacifica_1.jpg#/media/File:Waves_in_pacifica_1.jpg
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The photo on the left shows a wave that is caused by the wind. It is called a wind wave.
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Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Mavericks_Surf_Contest_2010b.jpg#/media/File:Mavericks_Surf_Contest_2010b.jpg
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"Underwater World" by Fascinating Universe - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Underwater_World.jpg#/media/File:Underwater_World.jpg
Over 4,000 different kinds of fish live in coral reefs.