Tides - PowerPoint Presentation

Presentation on theme: "Tides"— Presentation transcript

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Tides

May 2013Slide2
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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.Slide10
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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 tidesSlide13
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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 Slide15
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Bay of Fundy, Nova Scotia, CA

Bay of Fundy from space

Tide variation at Bay of FundySlide17