lesson62reading课件
日期：2010-06-07 06:10
班级：高二（3）班Taughtby:LearZhangTheArcticOceanEuropeAsiaAfricaOceaniaThePacificOceanSouthAmericaNorthAmericaAntarcticTheIndianOceanTheAtlanticOceansurfingenjoyingthesunshineswimming(冲浪）1Howsaltyisthewaterintheocean?A35%B11%C25%√2Whatisthesaltiestlakeintheworld?TheGreatSaltLake3Whereisthelongestcoralbedintheworld?ItliesoffthenortheastcoastofAustralia4Howdoesseawaterstayclean?SeaweedsproducevariouschemicalsthatkeeptheseacleanFastreading:generalideaPart1:thevastseaPart2:seawaterPart3:theMediterraneanPart4:coralintheseaPart5:saltlakes(theDeadsea)1Whatcolouristheearthifitisseenfromspace?Whyisthat?2Whycan’tweseemuchsolidsurfacefromspace?Blue:Littlesolidsurface:2/3belowtheseasalty:Part2:seawater35%Clean:seaweedschemicalstheMediterranean3，700km1，800km25℃-29℃37-39%theMediterraneantheMediterraneanSalt:37%-39%Whyisitsosalty?a?????hotweatherb?????losingwatertotheairc?????hardtobechangedw，
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