题目
有关于地球的英文故事
提问时间:2020-07-26
答案
璧勬枡澶?綘鎵剧偣甯歌瘑鎬х殑鍚?
Earth is the only planet whose English name does not derive from Greek/Roman mythology.The name derives from Old English and Germanic.There are,of course,hundreds of other names for the planet in other languages.In Roman Mythology,the goddess of the Earth was Tellus - the fertile soil (Greek:Gaia,terra mater - Mother Earth).
It was not until the time of Copernicus (the sixteenth century) that it was understood that the Earth is just another planet.
Mir space station and Earth's limb Earth,of course,can be studied without the aid of spacecraft.Nevertheless it was not until the twentieth century that we had maps of the entire planet.Pictures of the planet taken from space are of considerable importance; for example,they are an enormous help in weather prediction and especially in tracking and predicting hurricanes.And they are extraordinarily beautiful.
The Earth is divided into several layers which have distinct chemical and seismic properties (depths in km):
0- 40 Crust
40- 400 Upper mantle
400- 650 Transition region
650-2700 Lower mantle
2700-2890 D'' layer
2890-5150 Outer core
5150-6378 Inner core
The crust varies considerably in thickness,it is thinner under the oceans,thicker under the continents.The inner core and crust are solid; the outer core and mantle layers are plastic or semi-fluid.The various layers are separated by discontinuities which are evident in seismic data; the best known of these is the Mohorovicic discontinuity between the crust and upper mantle.
Most of the mass of the Earth is in the mantle,most of the rest in the core; the part we inhabit is a tiny fraction of the whole (values below x10^24 kilograms):
atmosphere = 0.0000051
oceans = 0.0014
crust = 0.026
mantle = 4.043
outer core = 1.835
inner core = 0.09675
The core is probably composed mostly of iron (or nickel/iron) though it is possible that some lighter elements may be present,too.Temperatures at the center of the core may be as high as 7500 K,hotter than the surface of the Sun.The lower mantle is probably mostly silicon,magnesium and oxygen with some iron,calcium and aluminum.The upper mantle is mostly olivene and pyroxene (iron/magnesium silicates),calcium and aluminum.We know most of this only from seismic techniques; samples from the upper mantle arrive at the surface as lava from volcanoes but the majority of the Earth is inaccessible.The crust is primarily quartz (silicon dioxide) and other silicates like feldspar.Taken as a whole,the Earth's chemical composition (by mass) is:
South America by Galileo
34.6% Iron
29.5% Oxygen
15.2% Silicon
12.7% Magnesium
2.4% Nickel
1.9% Sulfur
0.05% Titanium
The Earth is the densest major body in the solar system.
The other terrestrial planets probably have similar structures and compositions with some differences:the Moon has at most a small core; Mercury has an extra large core (relative to its diameter); the mantles of Mars and the Moon are much thicker; the Moon and Mercury may not have chemically distinct crusts; Earth may be the only one with distinct inner and outer cores.Note,however,that our knowledge of planetary interiors is mostly theoretical even for the Earth.
Unlike the other terrestrial planets,Earth's crust is divided into several separate solid plates which float around independently on top of the hot mantle below.The theory that describes this is known as plate tectonics.It is characterized by two major processes:spreading and subduction.Spreading occurs when two plates move away from each other and new crust is created by upwelling magma from below.Subduction occurs when two plates collide and the edge of one dives beneath the other and ends up being destroyed in the mantle.There is also transverse motion at some plate boundaries (i.e.the San Andreas Fault in California) and collisions between continental plates (i.e.India/Eurasia).There are (at present) eight major plates:
North American Plate - North America,western North Atlantic and Greenland Earth's Plate Boundaries delineated by earthquake epicenters South American Plate - South America and western South Atlantic
Antarctic Plate - Antarctica and the "Southern Ocean"
Eurasian Plate - eastern North Atlantic,Europe and Asia except for India
African Plate - Africa,eastern South Atlantic and western Indian Ocean
Indian-Australian Plate - India,Australia,New Zealand and most of Indian Ocean
Nazca Plate - eastern Pacific Ocean adjacent to South America
Pacific Plate - most of the Pacific Ocean (and the southern coast of California!)
There are also twenty or more small plates such as the Arabian,Cocos,and Philippine Plates.Earthquakes are much more common at the plate boundaries.Plotting their locations makes it easy to see the plate boundaries.
Earth is the only planet whose English name does not derive from Greek/Roman mythology.The name derives from Old English and Germanic.There are,of course,hundreds of other names for the planet in other languages.In Roman Mythology,the goddess of the Earth was Tellus - the fertile soil (Greek:Gaia,terra mater - Mother Earth).
It was not until the time of Copernicus (the sixteenth century) that it was understood that the Earth is just another planet.
Mir space station and Earth's limb Earth,of course,can be studied without the aid of spacecraft.Nevertheless it was not until the twentieth century that we had maps of the entire planet.Pictures of the planet taken from space are of considerable importance; for example,they are an enormous help in weather prediction and especially in tracking and predicting hurricanes.And they are extraordinarily beautiful.
The Earth is divided into several layers which have distinct chemical and seismic properties (depths in km):
0- 40 Crust
40- 400 Upper mantle
400- 650 Transition region
650-2700 Lower mantle
2700-2890 D'' layer
2890-5150 Outer core
5150-6378 Inner core
The crust varies considerably in thickness,it is thinner under the oceans,thicker under the continents.The inner core and crust are solid; the outer core and mantle layers are plastic or semi-fluid.The various layers are separated by discontinuities which are evident in seismic data; the best known of these is the Mohorovicic discontinuity between the crust and upper mantle.
Most of the mass of the Earth is in the mantle,most of the rest in the core; the part we inhabit is a tiny fraction of the whole (values below x10^24 kilograms):
atmosphere = 0.0000051
oceans = 0.0014
crust = 0.026
mantle = 4.043
outer core = 1.835
inner core = 0.09675
The core is probably composed mostly of iron (or nickel/iron) though it is possible that some lighter elements may be present,too.Temperatures at the center of the core may be as high as 7500 K,hotter than the surface of the Sun.The lower mantle is probably mostly silicon,magnesium and oxygen with some iron,calcium and aluminum.The upper mantle is mostly olivene and pyroxene (iron/magnesium silicates),calcium and aluminum.We know most of this only from seismic techniques; samples from the upper mantle arrive at the surface as lava from volcanoes but the majority of the Earth is inaccessible.The crust is primarily quartz (silicon dioxide) and other silicates like feldspar.Taken as a whole,the Earth's chemical composition (by mass) is:
South America by Galileo
34.6% Iron
29.5% Oxygen
15.2% Silicon
12.7% Magnesium
2.4% Nickel
1.9% Sulfur
0.05% Titanium
The Earth is the densest major body in the solar system.
The other terrestrial planets probably have similar structures and compositions with some differences:the Moon has at most a small core; Mercury has an extra large core (relative to its diameter); the mantles of Mars and the Moon are much thicker; the Moon and Mercury may not have chemically distinct crusts; Earth may be the only one with distinct inner and outer cores.Note,however,that our knowledge of planetary interiors is mostly theoretical even for the Earth.
Unlike the other terrestrial planets,Earth's crust is divided into several separate solid plates which float around independently on top of the hot mantle below.The theory that describes this is known as plate tectonics.It is characterized by two major processes:spreading and subduction.Spreading occurs when two plates move away from each other and new crust is created by upwelling magma from below.Subduction occurs when two plates collide and the edge of one dives beneath the other and ends up being destroyed in the mantle.There is also transverse motion at some plate boundaries (i.e.the San Andreas Fault in California) and collisions between continental plates (i.e.India/Eurasia).There are (at present) eight major plates:
North American Plate - North America,western North Atlantic and Greenland Earth's Plate Boundaries delineated by earthquake epicenters South American Plate - South America and western South Atlantic
Antarctic Plate - Antarctica and the "Southern Ocean"
Eurasian Plate - eastern North Atlantic,Europe and Asia except for India
African Plate - Africa,eastern South Atlantic and western Indian Ocean
Indian-Australian Plate - India,Australia,New Zealand and most of Indian Ocean
Nazca Plate - eastern Pacific Ocean adjacent to South America
Pacific Plate - most of the Pacific Ocean (and the southern coast of California!)
There are also twenty or more small plates such as the Arabian,Cocos,and Philippine Plates.Earthquakes are much more common at the plate boundaries.Plotting their locations makes it easy to see the plate boundaries.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
最新试题
- 1说明了赵州桥什么样的特点
- 2小学六年级下册英语有什么要加ing形式,有什么加原型
- 3英语翻译
- 4当一辆汽车从斜坡高处驶下时突然刹车.请问能量的转换(动能,势能,机械能如何转换).
- 5This will make you richer,e____ in things that money can’t buy.
- 6小明周末六点多时与妈妈去超市买东西此时他发现时钟分针与时针成110度角,快七点时他们回到家此时小明又发现时钟分针与时针成110度角,请问小明从家离开到回来一共用多长时间
- 7甲乙两队修一条路,乙队单独修10天完成,甲队每天修150公里,如果两队和修2/9天可以修全路的3/4,这条路全长多少公里?
- 8倒装句:Mary likes speaking Chinese,so___we.
- 9the back of their hands
- 10医院将9克NaCl与991克H2O混合,配置成生理盐水,生理盐水溶质质量分数为多少
热门考点
- 11.39个同学在操场上跳绳,每3人一组,可以分成多少组?2.4棵杨树苗48元,3棵松树苗63元,哪种树苗每棵
- 2上海红星服装厂要为世博志愿者生产2000套服装,5天生产了这批服装的五分之二,离交货日期只有一周了,照这样的速度能完成任务吗?
- 3已知|x+(-2)|+|y+3|+|z|=0,求x+y+z的值.
- 4父亲节英文介绍
- 5根号18除以根号6等于
- 6小苏打 柠檬酸做饮料
- 7小明从镜子里看到镜子对面的钟表里的时间是2点30分,实际时间为_点_分.
- 8一个数被6、7、8除都余1,这个数最小是_.
- 9小明解方程2x-1 5 +1=x+a 2 时,由于粗心大意,在去分母时,方程左边的1没有乘以10,由此求得的解为x=4
- 10公式 一电能表上标有1500R/KW.h,某同学用它测量一用电器的功率,只接通该用电器时,在4min内,电能表表盘转