About Coastline

The coastline is the boundary between a body of water, such as an ocean or a sea, and the land to which it is adjacent. Coastlines are not constant features but are continuously changing as the result of geological, weather, and other forces. Perhaps the most common factor affecting a coastline is tides. Tides are periodic rises and falls of sea level caused by the gravitational attraction of the Moon and Sun. As Earth rotates on its axis and travels around the Sun, it takes different positions with respect to these two bodies. Sometimes the three bodies are lined up with Earth between the Moon and the Sun:

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