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Essay example - Tides

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Pages 3 (753 words)
There are many phenomena that occur in the universe, many of which take place on this very planet. One of these phenomena is the occurrence of tides. Tides are the rise and fall in the height of the sea relative to the height of the land. (Cooley, 2002)…

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(Enchanted Learning, 2008). The ability to accurately predict tides has a variety of important implications, including coastal navigation. (Wikipedia, 2008). Because tides have such important implications, it is important and useful to examine the processes by which changing tides occur.
There are two high tides and two low tides every day, with about "12 hours and 25 minutes between the two high tides." (Cooley, 2002). The exact time the high tide occurs depends on the relative location of the moon to earth. The distance between the earth and the moon is a crucial factor in determining tides and tidal range. Two words that are helpful to understand in examining the distance between the earth and moon are "perigee" and "apogee." When the moon is at perigee, or its closest to the earth, the tidal range is increased. When the moon is at apogee, or its farthest distance from the earth, this range is decreased. (Whipple, 2007 & Wikipedia, 2008).
The reason that the distance of the earth from the moon has such a profound effect on tidal range is because of gravitational pull. Although the mass of the moon is much less than the mass of the earth, the moon still pulls the earth towards it by means of its gravity. ...
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