TIDES.

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TIDES Are periodic rise and fall of all ocean waters caused by the gravitational attraction of the moon and the sun upon the water and upon the earth itself.

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Presentation transcript:

TIDES

What are Tides? Tides- are very long-period waves that move through the oceans in response to the forces exerted by the moon and sun. Originate in the oceans and progress toward the coastlines. High Tide- rise (crest) Low Tide – fall (trough) High Tide – Low Tide = Tidal Range.

What Creates a Tide? Gravity Inertia 2 Bulges major force responsible for creating tides Inertia acts to counterbalance gravity 2 Bulges Created by Gravity and Inertia

Gravity and Inertia = Bulge NEAR SIDE Side of Earth facing the moon gravitational attraction is strongest (E and M) because closer Inertia tries to keep the water in place Water - Pulled toward Moon Result: Bulge due to gravity

Gravity and Inertia = Bulge FAR SIDE Opposite side of the Near Side of Earth where the gravitational attraction of the moon is less because it is farther away. Inertia counteracts the gravitational force Water- moves away from the Earth Result: Bulge - Inertia REST gravity and inertia = balanced http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/tides.htm

Neap Tide Occur: Contribution: Type: Gravitational forces are perpendicular to each other (S and M to E) 1st Quarter Moon 3rd Quarter Contribution: Moon: gravitational forces Sun: gravitational forces Type: Weak

Spring Tide Occur: Contribution: Type: Earth, the Sun, and the Moon are in a line Full Moon New Moon Contribution: Moon: gravitational forces Sun: gravitational forces Type: Strong

http://www.youtube.com/watch?v=l37ofe9haMU http://video.nationalgeographic.com/video/kids/animals-pets-kids/invertebrates-kids/crab-sandbubbler-kids/

http://www. oceanservice. noaa http://www.oceanservice.noaa.gov/education/kits/tides/media/supp_tide05.html http://home.hiwaay.net/~krcool/Astro/moon/moontides/