八年级英语下册Unit7KnowOurWorldLesson38TheWorldIsaBigPlace课件新版冀教版.ppt

Thinkaboutit Howmanycontinentsarethereintheworld Whatarethey Whatdoyouknowabouttheplacewhereyoulive Howmanycontinentsarethereintheworld Whatarethey Africa Asia Europe Oceania Antarctica SevenContinents NorthAmerica SouthAmerica ThePacificOcean TheIndianOcean TheAtlanticOcean TheArcticOcean Oceanscoveraboutthree quartersoftheearth ssurface desert Desertscovertwentypercentoftheearth ssurface What stheworld sbiggestisland Theworld sbiggestislandisGreenland GreenlandisnortheastofCanada Greenland Words expressions Listenandread Theearthisaveryspecialplanet anditfacesabigproblem Intheyear2010 theworld spopulationwasover7billionintotal Itisincreasingveryquickly By2025 theworld mayhaveabout8billionpeople Andby2050 theworld spopulationmayreach9billion Thereisanotherproblem Peoplecan tliveeverywhereontheearth Wecan tliveinwater andonlyaboutonethirdofourplanetisland Butpartsofthislandareverydry Thesedryplacesarecalleddeserts Someareashaveveryhighmountains Othershavealotofsnowandice Itisnoteasytoliveinthoseplaces Therearesevencontinents Asia Africa Australia Antarctica Europe NorthAmericaandSouthAmerica Antarcticaiscoveredwithsnowandiceallyearround Luckily peoplecanliveontheothersixcontinents Onthesecontinents therearegreenforests freshwaterandrichlands Oceanscovertwothirdsoftheearth ssurface Theearthhasonlyonebigocean but weusethesenamesforitsdifferentparts thePacificOcean theIndianOcean theAtlanticOceanandtheArcticOcean ThePacificOceanisthelargestone Theearthisourhomenow anditwillbeourhomeinthefuture Itmustbetreatedwellforourchildrenandforourchildren schildren too Languagepoints