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  • LATITUDE AND CLIMATELOCATION, LOCATION, LOCATIONOBJECTIVE:

    Identify and locate the four special lines of latitude and explain how climate is affected by location.

  • BELL RINGERLuis goes to the hardware store to make a purchase. He asked the clerk, How much will six cost? The clerk thought for a moment and said, Three dollars. Luis then asked, How much will thirty six cost? Six dollars, replied the clerk. Luis scratched his head and said, If I bought three hundred sixty, how much would that cost? That will cost you nine dollars, said the clerk. What was Luis buying?

  • YESTERDAYS ANSWERSid would be 160 cm tall (thats about 53)If Sids height is 80 cm plus half of his height, then 80 cm must be the other half of his height80 + 80 = 160

  • CLASSROOM RULESComply with all federal, state and district policiesDo not do anything that creates unsafe or unhealthy conditions in my classroomDo not do anything that interferes with your learningDo not do anything that interferes with anyone elses learningDo not let anyone else interfere with your learning

  • CLASSROOM PROCEDURESBring and use the proper materials at the proper timeNo gum or foodDo not talk except when the activity permits or when you have a question (raise your hand first).Stay in your seat unless you have permissionDo not do work from other classes unless you have permissionListen carefully to instructions, execute them to the best of your ability, and ask if you do not understand themParticipate in the lesson by doing the correct activity at the correct time: listen, ask questions, discuss, read, write, research.

  • VOCABULARYTerms we will be using todayArctic CircleTropic of CancerTropic of CapricornAntarctic CirclePrecipitationGrowing Season

  • THE MAGIC NUMBERThe four special lines of latitude all involve one number: 23.5The Arctic Circle is 23.5 from the North PoleThe Tropic of Cancer and Tropic of Capricorn are each 23.5 from the EquatorThe Antarctic Circle is 23.5 from the South Pole

  • WHY 23.5?

  • AXIAL TILT IS THE REASON FOR THE SEASONSBecause the Earths axis is tilted 23.5, the angle of the suns rays is different at different points on the surface, depending upon where Earth is in its orbitWhen the sun shines more directly on the surface, more heat is applied to the surfaceWhen the sun shines less directly (the proper term is obliquely), less heat is applied to the surfaceIn the Northern Hemisphere, the sun shines more directly during April-September and more obliquely during October-MarchIts opposite in the Southern Hemisphere

  • YOU DOOn your world mapFill in your name, period and the dateUse a ruler, a folded piece of paper or something else with a straight edge to draw the Equator and the two Tropic lines on the next slideHelp your partner if they need it

  • LOCATIONS OF THE TROPICS

  • AXIAL TILT IS ALSO A REASON FOR CLIMATEBetween the Tropic of Cancer and the Tropic of Capricorn, the sun always shines most directlyThere will be two days during the year when the sun passes directly overhead (on the Tropics, it happens once per year and that day is called a solstice)The Tropics are sometimes called the low LatitudesTemperatures are generally high with no clear differences between seasons (depending on elevation)Usually lots of rain and very long growing seasonDay/Night are fairly equal, year round and twilight is short

  • YOU DOOn your world map:Use a ruler, a folded sheet of paper or something with a straight edge to draw the two Circles on the next slideHelp your partner if they need it

  • LOCATION OF THE CIRCLESArctic CircleAntarctic Circle

  • AXIAL TILT IS ALSO A REASON FOR CLIMATEBetween the Poles and the Circles, the sun always shines most obliquelyThere will be one or more days during the year when the sun never rises and one or more days when it never setsThe area is called Polar or the high LatitudesTemperatures are generally cold with very long winters and very short growing seasonsDay/Night times are most unequalLong periods of twilight

  • LOCATION OF THE TEMPERATE ZONESNorthern Temperate ZoneSouthern Temperate Zone

  • AXIAL TILT IS ALSO A REASON FOR CLIMATEBetween the Tropics and the Circles are the temperate zones or mid-latitudesFairly distinct seasonal temperature differencesModerate precipitation (either as rain or as snow/ice)Seasonal differences in the number of hours of day/nightLong or moderate growing seasonsModerate to long periods of twilight (longer twilight as you move north)

  • LATITUDE DETERMINES PRECIPITATION?

  • POPULATION PREDICTIONSIf Latitude affects temperatures (it does) ANDIf Latitude affects precipitation (it does) THENWhere would be expect to find people living?Many people living in areas where there are moderate temperatures and enough rainfall to support agricultureMany people living in areas where there are high temperatures and enough rainfall to support agricultureFew people in areas with moderate temperatures and little precipitationFew people in areas with low temperatures and lots of precipitation

  • EFFECT ON PEOPLE

  • CONCLUSIONSLatitude has a very strong effect on temperatures, but it is not the only factorTemperatures are a major factor in the length of the growing season (edible plants do not handle freezing well)Latitude has a very strong effect on precipitation, but it is not the only factorTemperature and rainfall determine what kinds of plants can be grown (snow doesnt help until it melts)The eastern half of North America has both moderate temperatures and good precipitation, so we expect to find many people and there are

  • HOMEWORKGiven a blank world map:Draw and label:Prime MeridianEquatorTropic of CancerTropic of CapricornArctic CircleUse a ruler or straight-edge to make the lines (no freehand)Label:Atlantic OceanPacific OceanIndian OceanArctic OceanNorth AmericaSouth AmericaEuropeAsiaAfrica

  • TOMORROWWe will use Latitude and Longitude as a coordinate system to locate places on the Earths surface.

    Small Hint: If you pay attention, you will see them everywhere in town and you probably have them at your house. It might even be required to have them at your house. *

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