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Ocean Tides


Traci Fransen

on 9 March 2010

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Transcript of Ocean Tides

Double click anywhere & add an idea Ocean Tides Neap Tides Spring Tides Proxigean Spring Tides Unusually high tide
Occurs when both the moon and the sun are unusually close and in the New Moon phase.
Occurs at most only once every 1.5 years. Fun Fact:
*During the last 400 years, there have been 39 instances or 'Extreme Proxigean Spring Tides' where the tide-producing severity has been near the theoretical maximum. The last one of these was on March 7 1995 Definition:
*Periodic rise and fall of the ocean level induced by gravitational attraction between the earth and moon in combination with earth rotation. 3 Types:
Neap Tides
Spring Tides
Proxigean Spring Tides A "Spring Tide" is a tide that rises highest and falls lowest from the mean sea level at any time of the year and in any season of the year.
These tides normally occur semimonthly as the result of the Moon being new or full and increase the speed of tidal currents
Occurs when the earth, moon, and sun are all in line with each other Especially weak tides
Occur when the sun, earth, and moon form a right angle.
Occurs during the 1st and 3rd quarters of the moon
Why does the time of high/low tide change daily? This happens when the sun and the moon pull together making the tide rise higher, while some of the time they don't pull together causing the tide not to rise as high. Another factor is that as the moon moves around the earth, it is closer at some points than others. When the moon is nearer, its gravity pulls more strongly
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