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TidesHow They Work and Why They
Are So Important
Beatrix Hutton
2005
How They Work and Why They Are So Important
Beatrix Hutton
2005
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A Basic Definition
• Alternating rising and falling of water due to the position of the Sun and the moon and the earth.
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How Tides are Formed:High Tides
• Are formed when the moon is facing the water and pulls the water upward
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Parallel Universe
• A high tide is formed and a high tide is formed at the exact opposite side of the earth.
• This is caused by earth’s rotation.
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In The Middle
• Between the 2 high tides two low tides are formed.
• This is repeating constantly around the world
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Spring Tides• Are stronger and bigger than other
tides• ocean rises to full capacity• formed when the sun and moon line
up with earth
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Neap Tides
• Are smaller and weaker than other tides
• they are weaker than other tides because the moon’s attracting force is partly canceled out
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At the Beach
• At most beaches and lakes there are two tidal cycles
• high tide and low tide =tidal cycle
• 2 tidal cycles =semidiurnal
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Diurnal Tides
• In a few places there is only one tidal cycle
• these are called diurnal tides
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Falling and Rising Tides
• There are several other tides
• rising tides=flood tides• falling tides=ebb tides• lowest point at low
tide and highest point at high tide =slack tide
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Longshore Drift
• Long shore drift is a strong current of water than runs almost parallel to shore
• it can go in one way or another depending on the wind
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Riptides
• Riptides are a fast moving water current
• the Long shore drift combines with the angle the ocean hit the beach to produce riptides
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What to do if you are caught in a Riptide
• The rip current can push you out if you are not careful.
• If you are ever caught in a rip tide you should swim with the current until you are free of the current. Then you can swim back to shore.
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Beach Erosion
• Tides cause a lot of erosion
• If nothing keeps the sand in place it will completely wash away
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Xtreme Places
• The Bay of Fundy has the largest tidal ranges in the world
• it has a range of 50 ft while most beaches only have a range of 5 of 6 feet
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Newton and Tides
• Until the 19th century the only way used to explain tides was Newton’s laws
• Newton did not do much work with tides
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Solar Tides and Lunar Tides
• Lunar, Moon, tides are stronger than Solar, Sun, tides because the moon is so much closer to the earth even though it is much smaller than the sun.
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Extra Info
• Every 14 days spring tides are produced
• 7 days later neap tides take place
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Bibliography
• No Author mentioned.Scholastic Atlas of Oceans. QA International. Montreal. 2004.pgs. 40-41.
• K. Lee Lerner and Brenda Wilmoth Lerner. U X L Encyclopedia of Water Science. Volume 1
• Information and Facts on Ocean Tides. No author given. The time last updated not given.Accessed 5/19. At <http.//gometaldetecting.com/ocean-tides.html>
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Bibliography continued
• No author given. Tides. Accessed 4/29/05. Last updated 2005. <http://geography.about.com/od/physical geography/a/tides.htm>
• Tides. U X L Encyclopedia of Science.2nd edition.U X L.2002 Junior Reference Collection. Thomson Cale. 4/29/05.<http://galenet.galegroup.com/servlet/JRC>
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About the AuthorHi, my name is Beatrix Hutton. I always liked science and I really love marine biology. The trip to the Florida Keys really made me interested in the ocean. Since I learned to snorkel there I have been trying to learn more about the ocean and the animals living there. I think that I might consider a job in marine biology after I graduate from college.