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theevidencethatsuggeststhatitishotterinsidetheearthgivemetheevidencelneedtoproveit
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更新时间:2024-04-26 07:55:28
问题描述:

theevidencethatsuggeststhatitishotterinsidetheearth

givemetheevidencelneedtoproveit

冯小天回答:
  Theoutsideoftheearthisacrustofrockwhichisabout10to30milesthick.Whenwegodownintothiscrust,wefindthatitbeginstogethotterandhotter.Foraboutevery40meterswegodown,thetemperaturegrowsonedegreehigher.   Attwomilesbelowthesurfaceoftheearththetemperatureishighenoughtoboilwater!Ifitwerepossibletodigdown30miles,thetemperaturewouldbeabout1,200degreesCentigrade.Thisishotenoughtomeltrocks.Atthecentreoftheearth,scientistsbelievethetemperaturetobeabout5,500degreesCentigrade.   Thecrustoftheearthhastwolayers.Theupperlayer,whichmakesthecontinents,ismadeupofgranite.Underthelayerofgraniteisathicklayerofveryhardblackrockcalled"basalt".Thislayersupportsthecontinentsandformsthebasinsthatholdtheoceans.Atthecentreoftheearth,itisbelievedthatthereisahugeballofmolteniron,withadiameterofabout4,000miles.   Howdidthecentreoftheearthgettobethisway?Accordingtomostscientifictheories,theearthandsunwereoncerelatedinsomeway.Mostscientistsbelievethattheearthwasonceahot,whirlingmassofgas,liquid,orsolidthatbeganitsregulartripsaroundthesun.Asyearswentby,itslowlycooledandthelargemassgrewsmaller.Asitwhirled,itslowlytookaball-likeshape.Itwasred-hotandheldinitspathbytheattractionofthesun.   Astheearthcooled,ahardcrustformedonthesurface.Nobodyknowshowlongittookforthecrusttoform.Butunderneaththatcrustthereremainedthehotcentrecoreoftheearth,anditisstilltheretoday.
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