最新The-Mississippi-River-密西西比河课件PPT.ppt 34页

'The-Mississippi-River-密西西比河 Contents1Name2Geography3History4Navigation&Floodcontrol5Inpopularculture NameNameorigin:Ojibweword(印第安人阿耳冈昆族语言)misi-ziibi,meaning"GreatRiver",gichi-ziibi,meaning"BigRiver"NicknameTheFatherofWatersTheGatheringofWatersTheBigMuddyBodyofaNationBigRiverTheMightyMississippiOldManRiverOldBlueTheGreatRiverMoonRiver theUpperMississippiFromitsoriginatLakeItascatoSt.Louis,MissourtheMiddleMississippiFromSt.LouistotheOhioRiverconfluencetheLowerMississippifromitsconfluence（合流点）withtheOhioRivertoitsmouthattheGulfofMexicoRiverCourse Outflowanannualaveragerateofbetween200and700thousandcubicfeetpersecond(7,000–20,000m³/s)the5thlargestriverintheworldbyvolume(aftertheAmazonRiver,CongoRiver,RioMadeira,YangtzeRiver）Onaverage,theMississippihasonly8%theflowoftheAmazonRiver. History NativeAmericansModernAmericanIndiannationsinhabitingtheMississippibasinincludeCheyenne,Sioux,Ojibwe,Potawatomi,Ho-Chunk,Fox,Kickapoo,Tamaroa,Moingwena,QuapawandChickasaw.EuropeanexplorationColonizationSteamboateraCivilWar Navigation&Floodcontrol TheMississippiRiveristhelongestandmosteconomicallyimportantwaterwayintheUnitedStates.Thatindustryshipscorn,soybeans,andwheatfromfarmsintheMidwesttodestinationsaroundtheglobe.Roughly60percentofallgrainexportedfromtheUnitedStatestravelsonbargesalongthiswaterway.Anydisruptionhasarippleeffect."There"salotofmoneyatstakeforthesefarmers,andthere"sothercommoditiesthatarecomingdowntheriveraswell,soit"snotjustgrainbutit"salsochemicalsarecomingdowntheriver,coaliscomingdowntheriver,variousthingslikethat,"notedJasenBrown,aHydraulicEngineerwiththeArmyCorps. Flood:Mississippiatitsworst1FloodofMarch15432Floodof1734-353Floodof17884Floodof18095Floodof18256GreatFloodof18447GreatFloodof18518GreatMississippiFloodof19279GreatFloodof193710Floodof194511MississippiFloodof197312Floodof197513Floodof197914LowerMississippiFloodof198315GreatMississippiandMissouriRiversFloodof199316Floodof200217Floodof200818GreatMississippiFloodof2011 1830–1850:thegoldenageofsteamboats1830:FederalgovernmentNavigationlock(船闸)&canal1848:theIllinois&MichiganCanal—connectionoftheMississippi&theFiveLakes1913:theKeokukdam1917:LockandDamNo.11930:LockandDamNo.21930s:Twenty-threenewlocksanddamswerebuiltontheupperMississippiinadditiontothethreealreadyinexistence. Inpopularculture WilliamFaulknerMarkTwainHermanMelvilleLiterature WilliamFaulknerTheBearNobelPrizeforLiterature,1949 MarkTwainLifeontheMississippiAdventuresofHuckleberryFinn HermanMelvilleTheConfidence-Man MusicThesong"WhentheLeveeBreaks"byLedZeppelinAsetofmovementsforsymphonyorchestraentitled"MississippiSuite"byFerdeGrofé"Ol"ManRiver"—ThecentralmusicalpieceofthestageandmoviemusicalShowBoat"scentralmusicalpiece，composedbyMusical“BigRiver”TheJohnnyCashsong"BigRiver""RollOnMississippi"&"MississippiCottonPickingDeltaTown"MoonRiver That"sallThankyou 等边三角形(一）杨港初中俞英 观察下列图片，你有什么印象？ 你发现了什么？这就是今天我们要学的等边三角形 想想看，等边三角形有什么性质？ABC⑴三边之间AB＿AC＿BC⑵三角之间∠A＿∠B＿∠C＝＝＝＝ ⑵　等边三角形的三个内角都相等,并且每一个角都等于60°.等边三角形的性质⑴　等边三角形的三边都相等ABC）（60°60°(4)等边三角形各边上中线,高和所对角的平分线都三线合一.(3)等边三角形是轴对称图形，有三条对称轴 思考题？一个三角形满足什么条件就是等边三角形? 一般三角形等边三角形⒈三个角都相等的三角形是等边三角形.⒉有一个角是60°的等腰三角形是等边三角形.等边三角形等腰三角形 想一想课外活动小组在一次测量活动中,测得∠APB＝60°AP＝BP＝200cm,他们便得到了一个结论:池塘最长处不小于200cm.他们的结论对吗?）60°PAB 这是两个等边三角形,那么请移动三根火柴,将此图变成四个等边三角形.提示:此题并不难,如果外部不能解决,那么想想里面吧.考考你 例1：如图△ABC是等边三角形，DE∥BC，交AB，AC于D，E。求证：△ADE是等边三角形ABDCE 例2：如图，已知△ABC是等边三角形，BD是中线，延长BC至E，使CE=CD,求证：DB＝DEAEDCB课堂练习：教材P54练习 小结我们这节课学习了哪些知识?谈谈你的体会.1、等边三角形的性质2、等边三角形的判定方法 谢谢指导作业：教材P58第11题'