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以海洋生活为主题的英语手抄报

发表时间：2024-07-25 20:05:04 来源：网友投稿

Oceancoversalmostthreequarters(71%)ofthesurfaceoftheEarth,andnearlyhalfoftheworld'smarinewatersareover3000mdeep.

Thisglobal,interconnectedbodyofsaltwater,calledtheWorldOcean,isgenerallydividedbythecontinentsandarchipelagosintothefollowingbodies,fromthelargesttothesmallest:thePacificOcean,theAtlanticOcean,theIndianOcean,theSouthernOcean,andtheArcticOcean.Thelastoneisoceanographicallybetterdescribedasamediterraneansea,however.

Smallerregionsoftheoceansarecalledseas,gulfs,straitsandothernames.

Geologically,anoceanisanareaofoceaniccrustcoveredbywater.OceaniccrustisthethinlayerofsolidifiedvolcanicbasaltthatcoverstheEarth'smantlewheretherearenocontinents.Fromthispointofview,therearethreeoceanstoday:theWorldOcean,andtheBlackandCaspianSeasthatwereformedbythecollisionofCimmeriawithLaurasia.TheMediterraneanSeaisverynearlyitsownocean,beingconnectedtotheWorldOceanthroughtheStraitofGibraltar,andindeedseveraltimesoverthelastfewmillionyearsmovementoftheAfricanContinenthasclosedthestraitoffentirely,makingtheMediterraneanafourthocean.(TheBlackSeaisconnectedtotheMediterraneanthroughtheBosporus,butthisisineffectanaturalcanalcutthroughcontinentalrocksome7000yearsago,ratherthanapieceofoceanicseafloorliketheStraitofGibraltar.)

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