更新时间：2025-08-07 14:28:35
waterpollutioniscausedbywastefromfactoriesandcities.oceansareabletocleanthemselves,butcertainseas,oncetheybecomedirty,arenotabletodoso.oneexampleisthemediterraneanwhichliesbetweeneuropeandafrica.ithasonlyeonenarrowentrancetotheoceaninthewest.
onquarteroftheshoresofthemediterraneanarepollutedandarenolongersafeforswimming,asalotofdiseasesarepresentinthewater.inmostplacesitisnotsafetoeatthefish.
lakesalsohavethesameproblems.lakebaikalinasiawasoncethecleanestintheworld,withover700differentkindsofplantandanimallife.now,however,thewatersofthisgreatlake,whichisalsotheworld＇sdeepest(over1,740metres),havebeendirtiedbywastefromachemicalfactory.
in1989anoiltankerhitarockoffthenorthwestcoastofalaska.35,000tonsofoilpouredintothesea.theaccidentwasoneoftheworstinhistory.morethan34,000birdsand10,000animalswerekilled.4,800squarekilometresofoceanwerepolluted.
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