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22.3 Tides

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Katelynn Dorn

on 29 January 2015

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Transcript of 22.3 Tides

What Causes Tides
tides- daily changes in level of ocean surface
gravity causes oceans to bulge
low tides- water flows from area of low to high
tidal bulges appear to move westward around the earth
most locations have two high tides and two low tides daily
new moon/full moon- spring tides, high tidal range
1st and 3rd quarter moons- neap tides, low tidal range
Tidal Currents
toward coast- flood tide
away- ebb tide
slack water
tidal currents are strong in narrow bays and between coastlines
tidal bore- surge of tide water that rushes upstream from ocean
Behavior of Tides
Image by Tom Mooring
Tidal Variations
22.3 Tides
Bay of Fundy
Nova Scotia
greatest tidal range
15 m
Atlantic Coast of U.S. = semidiurnal
Gulf of Mexico = diurnal
Pacific Coast = irregular
tidal oscillations- slow rocking, motions of ocean water as tidal bulges move around oceans
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