Tides By: Katie Cardwell May 2005 By: Katie Cardwell May 2005.
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Transcript of Tides By: Katie Cardwell May 2005 By: Katie Cardwell May 2005.
TidesTidesBy: Katie CardwellBy: Katie Cardwell
May 2005May 2005
By: Katie CardwellBy: Katie Cardwell
May 2005May 2005
General InfoGeneral Info• Tides are the periodic rise and
fall of seawater
• These are caused by variations in gravitational attraction between the Earth, the moon and the sun
More InfoMore InfoMore InfoMore Info• There are two tidal bulges and two low points
each cycle
• One bulge is found on the closest point towards the moon
• The other is found on the opposite point of the earth
TimingTiming
• The timing of tidal events is related to the earth’s rotation and the revolution of the moon around the earth
• One revolution takes about 27 days and adds about 50 minutes to the tide cycle
Spring TidesSpring Tides
• Spring tides are very strong tides (they have nothing to do with the season spring)
• These occur when the earth, the sun, and the moon are in a line
More More Spring Spring TidesTides
More More Spring Spring TidesTides
• The gravitational forces of the moon and the sun both have influence on tides
• Spring tides occur during the full moon and the new moon
Proxigean Spring tidesProxigean Spring tides• These tides are rare and unusually high• This occurs when the moon is unusually close to the earth and is in the new moon phase
• This occurs at most once every 1.5 years
Neap TidesNeap TidesNeap TidesNeap Tides• These tides are
very weak tides
• They occur when the gravitational forces of the moon and the sun are perpendicular to one another (with the earth)
Diurnal TidesDiurnal TidesDiurnal TidesDiurnal Tides
• In some areas tides have one high and one low water per tidal day
• These are called diurnal tides
Mixed TidesMixed Tides• This is the
most common type of tide
• In these tides the high bulges are sometimes higher as well as lower, the same applies for low tides
About Me!About Me!
My Name is Katie Cardwell and I am 12 years old. I like swimming, dance, volleyball, and gymnastics. I love fast food, Italian, and desserts.
BibliographyBibliographyhttp://www.ndbc.nobc.noaa.gov/educate/
tides.shtml. May 2005.
http://www.physicalgeography.net/fundamentals/8r.html. May 2005.
http://www.enchantedlearning.com/subjects/ocean/Tides.shtml. May 2005.
UXL Encyclopedia of Science. May 2005.