Waves: crest - the highest point , trough - the lowest point, The rise and fall of sea level., A Tsunami is a special kind which can cause severe destruction. , , Currents: River-like movements in big bodies of water. They move in circular patterns., The Gulf Stream is on of these. It flows from the East Coast of North America to Europe., You will find these in warm or cold paths in the ocean. , , Long ago, sailors would use these to help them sail to far off lands., Tides: The up and down movements in the ocean caused by wind blowing across the ocean surface., These travel in large circular patterns and are bounded by large land masses., Caused by the gravitational pull of the moon., , There are two high and two low of these every day.,

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