问题标题：
【以海洋生活为主题的英语手抄报?如介绍海洋生物.关于海洋的都可以.(用英语说)】
问题描述：
以海洋生活为主题的英语手抄报?
如介绍海洋生物.关于海洋的都可以.(用英语说)
李京回答：
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,therearethree"oceans"today:theWorldOcean,andtheBlackandCaspianSeasthatwereformedbythecollisionofCimmeriawithLaurasia.TheMediterraneanSeaisverynearlyitsown"ocean",beingconnectedtotheWorldOceanthroughtheStraitofGibraltar,andindeedseveraltimesoverthelastfewmillionyearsmovementoftheAfricanContinenthasclosedthestraitoffentirely,makingtheMediterraneanafourth"ocean".(TheBlackSeaisconnectedtotheMediterraneanthroughtheBosporus,butthisisineffectanaturalcanalcutthroughcontinentalrocksome7000yearsago,ratherthanapieceofoceanicseafloorliketheStraitofGibraltar.)
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