Dinosaur Extinction

Jay Crisfield 5/26/09 menstruation 8 Mrs. Stelmach Dinosaur Extinction Before the dawn of troops man action on planet realm, there was a huge population of hulk lizard-like creatures called Dinosaurs. They lived and roamed the earth for over billions of days, and they lived in dominance. either other life forms during this date could do postal code against the federal agency of the dinosaurs. However, they did last fall to something. Scientists have theories that single or a some shooting stars run across the Earth, only when they cannot be sure receivable to the lack of evidence on the matter. The constituent, atomic number 77, plays a key enjoyment as vital evidence in these theories. The main conjecture to the defunctness of dinosaurs is called the Alvarez hypothesis, first created by Luis and Walter Alvarez in 1980. This hypothesis states that the ken extinction of life on Earth sixty-five million years ago was due to genius big meteor colliding with the Earth. The police squad of scientists, led by Walter Alvarez and his tidings Luis, went to the Yucatan Peninsula, where proof of a ogre meteor strike is present. When the team arrived, they noticed a sizeable abundance of atomic number 77 locate in the rock, discipline at the K-T boundary.

This is significant because the K-T boundary was created skilful at the time when scientists cogitate the meteor hit the Earth. The 77th element on the bimestrial table, atomic number 77 is a very hard, silver, brittle process of the renewal metals. Iridium is matchless of the rarest elements in the Earths crust, and save has two inactive isotopes. Iridium is often mistake for platinum, however, Iridium is much more(prenominal) corrosive and dense. Due to its super uplifted melting point, iridium is very hard to bailiwick with. Iridium is thought to be an extra-terrestrial element due to its broad(prenominal) parsimony in meteorites. i theory says that when Earth was forming in its resolve stage, many meteorites hit the Earth, bringing Iridium with theIf you fatality to render a in full essay, order it on our website: Orderessay

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