有关科普的英语文章

OurwaterpoloSomeonesays,ourearthshouldbecalledwaterpolo.Thismakessomesense,becauseweliveinthisplanetwithwater,and71%ofthesurfaceareaoccupiedbywater.Theastronaut,theearthisablueball,verybright,thesunfamilyoftheoneandonly.Theearth'swaterisverygreat,atotalvolumeof1386000000cubickm.Amongthem,96.5%intheocean;1.76%inglaciers,permafrost,snowcover,isasolidstate;1.7%intheground;theremaining,lakes,rivers,dispersedintheatmosphereandorganisms.Sowecansay,fromheaventoearth,fromlandtoocean,watereverywhereintheworld.Shakingheavenandearth'swatercycle,allthewaterintheworldisalinkedsystem.Seawaterinthesunlightirradiation,continuousevaporation,watervaportodiffuseintheocean;aportionofthevaporisairflowtofreezeoverland,itcondensesintosmalldroplets,intothecloud,andfallstothegroundisrainorsnow;snowwaterlanding,someflowintothepit,orintotheground,someintotheminorgroove,sinksintotheriver,tothesea.Numeroussmallwaterdropsiskeptintheworldtourism.Watercycletoensurehumanfreshwatersupply.Knowthecirculationofwater,andyoucanexplain:cloud'shometowninwhere?Whyisariverindayandnightisalwaysthestreamneverstopsflowing.?Whythousandsofyears,somanyriversflowintotheocean,buttheoceannotoverflow?Freshwaterwherethewaterontheearth,althoughlargequantities,andcandirectlyuseitinproductionandlife,andhasasmall.Firstofall,seasaltandbitter,notdrinking,notpouringin,itwillbedifficultfortheindustry.Secondly,freshwatertotalconsumption2.6%theleftandrightsides,mostofthem(99%),frozeninawayfromhumantwonorth-southandpermafrost,cannotuse,lessthan1%offreshwater,theyarescatteredinthelakes,riversandundertheground.Andthewholeworldtotalwatervolumeasadropinthebucketcompared,freshwater