TidesTides

Cyclical rise and fall of the oceans in Cyclical rise and fall of the oceans in response to the forces exerted by the response to the forces exerted by the moon and sun.moon and sun.

3 April 2006 - 4 April 2006Rye Beach - 40.9617° N, 73.6717° W

2006-04-03 03:13 EDT 7.82 feet High Tide2006-04-03 10:19 EDT 0.07 feet Low Tide2006-04-03 16:09 EDT 6.86 feet High Tide2006-04-03 22:13 EDT 0.87 feet Low Tide2006-04-04 04:16 EDT 7.23 feet High Tide2006-04-04 11:25 EDT 0.45 feet Low Tide2006-04-04 17:17 EDT 6.53 feet High Tide2006-04-04 23:36 EDT 1.14 feet Low Tide

Tidal data from http://tbone.biol.sc.edu/tide/tideshow.cgi?site=Rye+Beach&units=f

Bay of Fundy, Nova Scotia: 21 foot tides!One of the greatest tidal variations on Earth!

High Tide Low Tide

Exactly WHY are there Exactly WHY are there tidestides

Moon and Sun have a gravitational Moon and Sun have a gravitational attraction on the Earth’s oceans which attraction on the Earth’s oceans which creates a bulge.creates a bulge.

As the moon As the moon revolvesrevolves around the Earth, the around the Earth, the bulge moves across the Earth’s surface.bulge moves across the Earth’s surface.

Types of TidesTypes of Tides

Spring TideSpring Tide Unusually high

tide. The sun’s

gravitational pull reinforces the moon’s gravitational pull.

Occurs during the new and full moon phase.

Types of TidesTypes of Tides Neap TideNeap Tide

Unusually low tides

The sun’s gravitational pull is at a right angle to the moon’s gravitational pull

Occurs during the 1st and last quarter moon phases.

http://www.nos.noaa.gov/education/kits/tides/media/supp_tide06a.html

Monthly variation in the Monthly variation in the tidal bulgetidal bulge

Name that:

1.Lunar Phase

2.Tide

D

C

B

A