Britannica Learning Library Volume 02 - Planet Earth by Encyclopædia Britannica, Inc.

By Encyclopædia Britannica, Inc.

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Tidal bores,” The tides in the Bay of Fundy in Canada rise higher than force the river’s 53 feet. Beach towels and umbrellas at the Bay of Fundy flow to change don’t stand a chance! direction as they pass. 52 © 2008 Encyclopædia Britannica, Inc. © Tim Thompson/Corbis LEARN MORE! READ THESE ARTICLES… CONTINENTS • FLOODS • OCEANS TIDES RCH LI T GH SE A At high tide the water creeps high up on the beach. Answer: Each tidal cycle has one rising tide and one falling tide. It takes 6 hours for the tide to rise or fall, so it takes 12 hours for it to do both.

It takes another 6 hours for the falling waters to reach low At low tide the water slips low down on the beach. At high tide it will creep back up. tide. ” Tides are caused mainly by the gravity of the Moon and DID YOU the Sun pulling on the Earth. This causes ocean waters to pile up in a big bump of water directly beneath the Sun and the KNOW? Moon. As the Earth rotates, the tidal bumps try to follow the Some narrow two heavenly bodies. rivers that The Sun and the Moon are in line with the Earth during empty into the sea develop a full moon or a new moon.

The oceans are in constant motion. The gravity of the Moon and the Sun pulls on the oceans, causing tides—the regular rising and falling of the ocean along beaches and coastlines. The Earth’s rotation makes the oceans circulate clockwise in the Northern Hemisphere and counterclockwise in the Southern © Kennan Ward/Corbis Hemisphere. And winds cause waves to ripple across the ocean surface, as well as helping currents to flow underneath. Currents are like rivers within the ocean. Some are warm-water currents, which can affect temperatures on land, and some are cold-water currents, which generally flow deeper.

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