高二英语下学期Unit13 period 1 课件VIP免费

TheWaterPlanetTheWaterPlanetDoyouknowanyoftheDoyouknowanyofthefouroceans?fouroceans?•thePacificOcean•theAtlanticOcean•theIndianOcean•theArcticOceanCanyoufindthefouroceansonCanyoufindthefouroceansonthemap?themap?•世界地图thePacificOceantheAtlanticOceantheArcticOceantheIndianOceanDoyouknowanyofthesevenDoyouknowanyofthesevencontinents?continents?AsiaEuropetheNorthAmericatheSouthAmericaAntarcticaOceaniaCanyoufindthesevencontinentsCanyoufindthesevencontinentsonthemap?onthemap?Africa•世界地图AsiaEuropetheNorthAmericatheSouthAmericaAntarcticaOceaniaAfricaLet’sdosomeLet’sdosomeexperimentstoknowsomeofexperimentstoknowsomeofthepropertiesofwater.thepropertiesofwater.Picture1Picture1Experiment1showshowairpressurecausesapieceofcardboardtoclingtoanupturnedglassofwater.Picture2Picture2Experiment2showshowsubstancewithdifferentdensitybehavewhenplacedinthesamecontainer.Picture3Picture3Picture4Picture4Experiment3anexampleofhowwaterdissolvessubstanceandobjectsisExperiment4illustratessomeofthedifferencesbetweensaltwaterandfreshwater..Watercanbeusedtomakeelectricity.Waterenergyisleanandsafe,butdamssometimesdestroytheenvironment.Thisisagoodwaytousewaterbecausethewaterstayscleanandcanbereused.Everyonecanbenefitfromthewater.Plantsneedwatertogrow.Indryareas,Wehavetobringextrawatertogrowplantsandvegetables.Manypeoplewillbenefitfromthewayofusingwater.Weneedwatertogrowcrops,butalotofwateriswastedintheprocess.Wemustfindabetterwaytousewatersothatcropscangrowandwatercanbesaved.Inourhomes,Weusewatertocook,clean,washclothes,andwashourselves.Weoftenwasteaalotofwaterwhenweuseitathome.Everyoneusewaterathome,Ofcourse,butwaterusedathomeonlybenefitonefamilyoroneperson.Mostofuslovewatersportssuchasswimming,andplayingonthebeach.Thisisgoodwaytousewater,butmustmakesurethatwedon’tpollutethewaterorthrowtrashonthebeach.Ifwebuildtoomanyhotelsbythebeach,ortoomanypeoplevisitthebeach,itwilldisturbthesensitivewildlifeinouroceans,andrivers