May 2013 What is a TIDE Rise and fall in ocean levels Most observable at the coastlines What is a TIDE 2 High tides and 2 Low tides occur daily Approx 6 12 hours apart What causes TIDES ID: 510887
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Slide1
Tides
May 2013Slide2Slide3Slide4Slide5Slide6Slide7
What is a TIDE?
Rise and fall in ocean levels
Most observable at the coastlinesSlide8
What is a TIDE?
2 High tides and 2 Low tides occur daily
Approx. 6 1/2 hours apartSlide9
What causes TIDES?
The Moons gravity pulls up on the oceans because they are not attached to the Earth.
The Suns gravity also pulls up on the oceans.Slide10Slide11
Spring Tides
Occur during New and Full moons
Earth, Moon, and Sun align
Gravity from the Sun and Moon
PULL
on the oceans in the
SAME
direction
Big difference between High and Low tidesSlide12
Neap Tides
Occur during Quarter moons (Half moons)
Earth, Moon, and Sun form a right angle
Gravity of Moon and Sun
PULL
in
DIFFERENT
directions
Little difference between High and Low tidesSlide13Slide14
Tidal Range
Difference between High Tide and Low Tide in an area
High Tide – Low Tide = Tidal Range
Changes with positions of the Moon and Sun Slide15Slide16
Bay of Fundy, Nova Scotia, CA
Bay of Fundy from space
Tide variation at Bay of FundySlide17