英语presentation文稿

英语presentation文稿

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时间:2018-07-18

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1、①Helloeveryone,todayIwanttoshowyouapartofhowtheearthwasmade,andmainlytalkaboutYellowstone.②Ascontinentsshiftandclash,volcanoeserupt,andglaciersgrowandrecede,theEarth’scrustiscarvedincountlessfascinatingways,leavingatrailofgeologicalmysteriesbehind.Andoneoftheg

2、reatestisYellowstoneNationalParkinWyoming.Thisisoneoftheworld’smostgeologicallyactiveplaces,shakenbyupto5000earthquakeseveryyear,andwithmoregeysersandhotspringsthanintherestoftheworldcombined.ScientistsstudyingYellowstoneareuncoveringaviolentpast.Carvedwater,c

3、rushedbyancientglaciersandblastedbythebiggestvolcaniceruptionseverknownontheplanet.Andeventoday,YellowstoneisoneofthemostdangerousplacesonEarth.③YellowstoneisoneofthemostamazingplacesonEarth,andit’sunique.ItcontainssomeofAmerica’smoststunningsceneryandwildlife

4、.Yellowstone is the world’s first national park which is in the northwestern corner of Wyoming and overlaps into Montana and Idaho.Theparkcovers3468squaremiles,63milesnorthtosouthand54mileseasttowest.It’saveryunusualgeologythatcreatedthepark.④OldFaithfulisthes

5、tarattractionofYellowstone.It’soneofthemostpredictablegeographicalfeaturesonEarth,eruptingalmost91minutes.⑤BeneathOldFaithfulisarathercomplexplumbingsystem,filledwithcavernsandconduitsandconstrictions.Rainwatersaturatingthegroundaroundthegeyserslowlyfillsitsun

6、dergroundreservoir.Hotrocksbelowgroundheatthewaterunderpressureforaround90minutes.Suddenlysomewaterspurtsthroughatiny,fiveinchwidecrackintherocks.Thiscausesadropinthepressurewithinthewaterchamber.Inainstant,thousandsofgallonsofwaterareturnedtosteamandblastedup

7、intotheair.Thegasescomeoutfromthegeysersisthesamemixthatisfoundcomingoutofvolcanoes.Sogasesareclearevidencethatunderthespringsandgeysersisavolcano.Yellowstonemustbepoweredbytheheatofthevolcano.⑥Peoplecan’tseeasmokingvolcanoorabigsteepvolcaniccrater.Butwhereist

8、hevolcano?ScientistsfindoutevidencestoshowusthatYellowstoneisthesupervolcano.⑦Theblacklayerthatgeologistscall“obsidian”isactuallyatypeofglass.It’scrucialevidencethattherocksandsoil

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