污染课件
日期：2010-07-04 07:41
000peopledied2，WehaveonlyoneearthLandReadandanswer:1Whyistheareaofdesertgrowingeveryyear?2Whydocattlehavesomethingtodowiththegrowingdesert?3Whyisthesoilgraduallylost?4Whatcanwedotostopthesoillosing?DunhuangusedtobeagreatcityincreasecattletreescutdownCattleproblemSoillostlackofrainrainpouringnotkillcattlesoilwasheddowngrasseatenupSoilblownawayDunhuangisnowadesertAnyotherpollutioncanyouthinkof?waterpollutionairpollutionnoisepollutionlightpollutionradiationairpollutionWhatcanwelearnfromthispicture?Fishinginthe“rainyday”↑acidrainmask↑causes:FromfactoriesFrompowerstationFromcarsairpollutionreasonsyearcountrybadresultsAcloudofradiationDangerousgaschemical198619861984GermanyRussiaIndia50%oftreesdamaged125，500peoplediedListenandfillingswaterpollutionCanseascleanthemselves?Whataboutlakes?1Alltheseascancleanthemselves2TheMediterraneanwhichliesbetweenEuropeandAfricahasbeenpolluted3PeopleherecannotswimintheMediterranean，buttheycaneatthe，
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