may 2013. what is a tide? rise and fall in ocean levels most observable at the coastlines
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TidesMay 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 1/2 hours apart
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.
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 tides
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 tides
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
Bay of Fundy, Nova Scotia, CABay of Fundy from
spaceTide variation at Bay of
Fundy
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