The Shocking Truth About Impact Metamorphism

Introduction meteorite Falls have been a part of our history as living organisms of this planet . It may have been that our existence on this planet has been brought about by a major Meteor strike in the sense that it was hypothesized that the extinction of the once frequent species k flatn as the Dinosaurs was caused by a major meteor strike (Courtillot , 2003 The said meteor strike caused climate changes whch proved fatal to the said species . Although meteorite falls has been reported for thousands of years , until this vitamin C no one has ever identified a volcanic crater created by much(prenominal) a fall . The reason organism touchn is simple , Even a large meteorite may be slowed so much by the Earth s standard atmosphere that it lands without making a significant hole . However , scorn this unique protection , the Earth still experienced the lay waste to effect of a meteor impact . Scientists have now identified over 150 proven impact sites . essay suggests that there have been many thousands of other impacts over the cable of the domain s history . Meteorites weighing a quarter of a pound or more(prenominal) hit the earth thousands of times a year (Paine , M . 1999 . The HYPERLINK hypertext transfer protocol / entanglement .solarviews .com /eng /earth .htm Earth , without its protective layer called atmosphere , would have been more heavily scarred than the Moon , craters are continually erased by erosion and redeposition as well as by volcanic resurfacing and HYPERLINK http /www .solarviews .com /eng /terms .htm l tectonic tectonic activity . Spacecraft orbital imagery has helped to identify structures in more remote locations for further investigation . Meteorites are classified as rough , stony iron , and iron meteorites . The stony meteorites are further divided into those with chondrules (chondrites and those without chondrules (achondrites , which are roundish articles that salute that their fillings crystallized from a melt . Chondrites are further subdivided into some(prenominal) classes according to their mineralogical and chemical composition . Metamorphism can be define as the solid state re-crystallisation of pre-existing HYPERLINK http /en .wikipedia .

org /wiki /Rock_ 28geology 29 o Rock (geology rocks due to changes in alter and /or pressure and /or introduction of fluids without melting . It is the rescript and transformation in pre-existing rock masses effected by temperature and pressure , but excluding changes produced by weathering and HYPERLINK http /www .answers .com /sedimentation t _top sedimentation The changes may include the output of new minerals , structures , or textures , or all three . They give a distinctive new character to the rock as a whole , but they do not shoot the loss of individuality of a rock mass , such as changes brought about by fusion . Quantitatively , the HYPERLINK http /www .answers .com /metamorphic-rock t _top metamorphic rocks , including gneisses and migmatites , are the most beta group of rocks in the HYPERLINK http /www .answers .com /crust t _top crust of the continents There will be HYPERLINK http /en .wikipedia .org /wiki /Mineral o Mineral mineralogical , chemical and HYPERLINK http /en .wikipedia .org /wiki /Crystallography o Crystallography crystallographic changes (World of Earth...If you want to get a full essay, raise it on our website: Ordercustompaper.com

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