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Name______________________________ Time Zones

Night and Day DifferenceWhat causes the daily change from daylight to darkness? Day turns intonight because the earth rotates, or spins, on its axis, The earth's axis is animaginary line that cuts through the earth from the North Pole to the SouthPole, The earth spins in a counter-clockwise direction,

North Pole North PoleAxis..

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South Pole South PoleLet's demonstrate the difference between night and day,

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I

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International Date Line

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Name_____________________________

Time Zones

24-Hour GlobeThe earth is divided into 24 standard time zones. These time zones are set sothat large sections of the earth within each zone have the same time. In eachtime zone, people set their clocks and watches by the same time.Every 15 of longitude begins anew time zone. The time zone LONDON l105CoWNEWYORKboundaries roughly follow thelines of longitude. However,many of the boundaries do notfollow exactly the lines oflongitude. They have beenaltered to correspond to theboundaries of states andcountries.Directions: Use the WorldTime Zones map on page313 to answer the questionsbelow. AFTERNOON NEWS

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Name_______________________________Time Zones

A plane leaves Chicago at 5:30 P.M. heading for San Francisco. The flight takes 3 hours. At what time will it arrive in San Francisco? If you answered 8:30 P.M. to the above question, you are only partly correct. It would be 8:30 P. M. \\Chicago time" but it would be 6:30 P.M. in San Francisco because the plane crossed two time zones. Examine the time zones of the United States on the map on page 316. Notice lhat the time-zone boundaries do not always follow the state boundaries. Some states are in more than one time zone. Directions: Use the United States Time Zones map (page 316) to answer the

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3(,.)0.. Use with page 315.

MOUNTAIN TIME CENTRAL TIMEEASTERN TIME

Montana

Utah

Arizona

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ALASKA TIME

Wyoming

Colorado

New Mexico

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