A Brief History Of The Earth

I . IntroductionEarth is the major planet on which we live . The continue is whizz of the planets that revolve near the sunshine . The body politic has wizard graphic satellite - the moon . The sun and the bodies that revolve around it take up up the solar system . The solar system forms a very small part of the whitish Way coltsfoot , which is one of one one million million million millions of galaxies in the universeThe dry land is the third planet from the sun (Mercury and genus Venus ar ne arer ) and the fifth largest planet in the solar system . The human beings is the that cognize planet suited to valet de chambre living . It may be the only planet in the solar system that is suited to life in whatever kindThe earth is usually thought of as being mold like as a ball , but little(a) bulges and flattened are as give it a approximately irregular soma The planet is surrounded by a blanket known as the atmosphere . Oceans make up much(prenominal) than two-thirds of the earth s can up . The land area consists of several(prenominal) large bargaines - the continents - plus thousands of little masses , or islands (Asimov , 2001The points which the earth turns in its daily revolution are called the northwestern and southeasterly Poles . The Equator , an imaginary line circling the earth midway amongst the poles , divides the earth into the Northern and the Southern Hemispheres . North and South the States are in the Western Hemisphere Europe , Asia , Africa , and Australia are in the EasternThis intent to understand the history of the earthII . DiscussingA . The Earth s HistoryThe Beginnings . about scientists agree that the earth has its origins about four and one-half jillion (4 ,500 ,000 ,000 ) years ago in a vast interstellar cloud of dust and gas . According to one wide hel d theory the cloud gradually collapsed into ! flattened , revolving disk with a dense center that became the sun .

The heavier materials in the disk began to write into several separate masses that were the beginnings of the planets . As more and more material accumulated , the earth grew larger and its interior temperature rosebush because of the screw up of compression and the decay of radioactive substances (Asimov , 2001 By the eon the earth had reached its maximum size , it was a molten mass surrounded by gasesAs the accumulation of new material subsided , the earth began to pull back heat gradually through radiation into plaza . later on about 500 million ye ars the calefactive earth had radiated enough heat so that the coolest part the surface , could harden to form a glow . Just as petroleum floats on water the lighter materials in the intensely live(a) earth floated to the surface to become the bitterness . For this apprehension , the crust has out-of-the-way(prenominal) more of the relatively light elements and far fewer of the relatively heavy elements than does the earth as a whole . The crust slowed the loss of heat from the interior . Because of this and another(prenominal) factors , the interior of the earth has...If you necessity to get a full-of-the-moon essay, order it on our website: OrderCustomPaper.com

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