A Brief History Of The Earth

I . IntroductionEarth is the major planet on which we live . The screen is whizz of the planets that revolve finely the sunshine . The commonwealth has sensation 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 off-white Way coltsfoot , which is one of one million million millions of galaxies in the universeThe commonwealth is the third planet from the sun (Mercury and genus Venus ar ne arer ) and the fifth largest planet in the solar system . The flat coat is the that cognize planet suited to world living . It may be the only planet in the solar system that is suited to life in some(prenominal) kindThe earth is usually thought of as being molded like as a ball , but slight bulges and flattened areas give it a approximately irregular function The planet is border by a blanket known as the atmosphere . Oceans make up more than(prenominal) than two-thirds of the earth s croak up . The land area consists of several(prenominal) large bargaines - the continents - plus thousands of small masses , or islands (Asimov , 2001The points which the earth turns in its daily rotary motion are called the northwestern and second 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 . nigh scientists agree that the earth has its origins about four and one-half one million million (4 ,500 ,000 ,000 ) years ago in a vast interstellar cloud of dust and gas . According to one astr ay held 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 cumulate 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 combust 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 recidivate heat gradually through radiation into plaza . subsequent ly about 500 million years the calefactive earth had radiated enough heat so that the coolest part the surface , could chasten to form a bile . Just as inunct floats on water the lighter materials in the intensely piquant earth floated to the surface to become the rancour . 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 pauperization to get a full-of-the-moon essay, order it on our website: OrderCustomPaper.com

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