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Tides
Tides are daily changes in the elevation
of the ocean surface
Caused by the gravitational attraction upon
Earth by the moon and the sun
2 forces that produce tides
• Gravity
• Inertia
Tides
Tides
Tidal range
Difference in height between 2 high tides or 2 low
tides
Spring tides
Tides that have the greatest tidal range
Occur during the full moon and the new moon
Neap tides
Smallest rise and fall in tidal level (small tidal
range)
Neap tides occur during quarter moons
Tides
http://upload.wikimedia.org/wikipedia/commons/c/cf/Chiswick_Eyot_channel_at_low_tide_vs_high_tide.jpg
LOW TIDE HIGH TIDE
Tidal Patterns
3 main tidal patterns exist worldwide
1) Semidiurnal- 2 high tides and 2 low tides
each day (Atlantic Coast of the U.S.)
Tidal Patterns
2. Diurnal- 1 high tide and 1 low tide each
day (northern shore of the Gulf of
Mexico)
Tidal Patterns
3) Mixed tides- inequality in high water
heights and low water heights (Pacific
Coast of U.S. and in other parts of the
world)