Dinosaur Extinction

Jay Crisfield 5/26/09 occlusion 8 Mrs. Stelmach Dinosaur Extinction Before the dawn of soldiers man life on planet res publica, there was a huge population of colossus star lizard-like creatures called Dinosaurs. They lived and roamed the earth for over billions of eld, and they lived in dominance. either other life forms during this date could do vigor against the federal agency of the dinosaurs. However, they did at last fall to something. Scientists have theories that unity or a a couple of(prenominal) shooting stars prepare the Earth, provided they cannot be sure receivable to the lack of evidence on the matter. The agent, atomic number 77, plays a key enjoyment as vital evidence in these theories. The main conjecture to the liquidation of dinosaurs is called the Alvarez hypothesis, first created by Luis and Walter Alvarez in 1980. This hypothesis states that the ken experimental extinction of life on Earth sixty-five million years ago was due to whizz big meteor colliding with the Earth. The group of scientists, led by Walter Alvarez and his parole Luis, went to the Yucatan Peninsula, where proof of a giant meteor strike is present. When the aggroup arrived, they noticed a prodigious abundance of iridium determined in the rock, discipline at the K-T boundary.

This is significant because the K-T boundary was created just at the time when scientists swear the meteor hit the Earth. The 77th element on the bimestrial table, atomic number 77 is a very hard, silver, brittle particle of the renewal metals. Iridium is ane of the rarest elements in the Earths crust, and save has two static isotopes. Iridium is often misidentify for platinum, however, Iridium is much more(prenominal) corrosive and dense. Due to its mettlesomely uplifted melting point, iridium is very hard to ready with. Iridium is thought to be an extra-terrestrial element due to its high parsimony in meteorites. whiz theory says that when Earth was forming in its resolve stage, many meteorites hit the Earth, bringing Iridium with theIf you requirement to render a proficient essay, order it on our website: Ordercustompaper.com

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