tides how they work and why they are so important beatrix hutton 2005 how they work and why they are...
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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
A Basic Definition
• Alternating rising and falling of water due to the position of the Sun and the moon and the earth.
How Tides are Formed:High Tides
• Are formed when the moon is facing the water and pulls the water upward
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.
In The Middle
• Between the 2 high tides two low tides are formed.
• This is repeating constantly around the world
Spring Tides• Are stronger and bigger than other
tides• ocean rises to full capacity• formed when the sun and moon line
up with earth
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
At the Beach
• At most beaches and lakes there are two tidal cycles
• high tide and low tide =tidal cycle
• 2 tidal cycles =semidiurnal
Diurnal Tides
• In a few places there is only one tidal cycle
• these are called diurnal tides
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
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
Riptides
• Riptides are a fast moving water current
• the Long shore drift combines with the angle the ocean hit the beach to produce riptides
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.
Beach Erosion
• Tides cause a lot of erosion
• If nothing keeps the sand in place it will completely wash away
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
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
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.
Extra Info
• Every 14 days spring tides are produced
• 7 days later neap tides take place
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>
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>
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.
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