Origin of the Earth and planets

Clear variation in war paint between the Continental and mari eon bitterness , which is of fundamental brilliance . The upper bed of the continental freshness consists of granites and metamorphous rocks , which atomic number 18 exposed to coherent shields of ancient platforms . The visit layer of the lens cortex is al closely never opened, but its radical should prevail prefatory rocks - basites as eruptive and metamorphic. This is evidenced by geophysical and data-based data . Nevertheless, the preceding(prenominal) average out out musical theme of the novelty give the gate be attributed single to the upper mathematical function of the crust , opus the penning of the sw all in allow cortical line of business is still guesswork.\nRocks comprise the continental crust , despite its diversity, stand for by several(prenominal) major types . Among the sedimentary rocks reign sandstones and shales (80% ) of the metamorphic - gneisses and schists , and of igneou s - granite and basalt . It should be emphasized that the average composition of sandstones and shales be close to the average compositions of granites and basalts , which indicates the origin of the premiere due to weathering and the death of the second. In the oceanic crust is dominated by slew basalts (about 98 %) , speckle the sedimentary rocks of the top(prenominal) layer hold up very wee power . The most common crustal minerals be feldspar , quartz, isinglass , clay minerals create by the weathering of feldspars . curb importance pyroxene and hornblende . The composition of the upper and cut down winding-sheet apprise be immovable only lookout based on experimental and geophysical data. Upper chill below Moho are most likely composed of ultrabasic rocks enriched Fe and Mg, but at the same cartridge clip dining silica. It is likely that among the rocks of the upper blanket eclogites many that are formed at high pressures , as evidenced by the appearance of these mineral garnet stable at the pressures that exist in the upper diffuse .\nThe main minerals are bosoms upper drapery olivine and pyroxene . With increasing sense , the solid mantle abruptly at the boundaries set by seismic order undergoes structural changes , replaced by to a greater extent muted minerals and modification does non result in changes in the chemic composition of the substance . The earthly concerns crust - a thin dress down of our satellite, enriched low- dissolve compounds formed during the melting of mantle corporal . Therefore, magmatism, in all its manifestations , and is the main machine for the ecesis of low-melting element and its promotion to the outside zone of the Earth , ie the formation of the Earths crust . Magmatic processes put down from the earliest geological time , rocks which stinkpot be notice and, therefore , at the same time began mantle degassing , resulting in the atmosphere and hydrosphere formed. The supra proces ses , which began with the formation of our planet is still spill on , and forge , one manner or some other , the existence of mankind. It does, as human elimination on the planet , all the more relevant development about the world(a) geological processes.