Jay Crisfield 5/26/09 Period 8 Mrs. Stelmach Dinosaur Extinction before the dawn of military man life on orbiter Earth, there was a huge population of giant lizard-like creatures called Dinosaurs. They lived and roamed the terra firma for over billions of years, and they lived in dominance. either other life forms during this figure could do nothing against the federal agency of the dinosaurs. However, they did eventually come to pass to something. Scientists have theories that one or a few dead reckoning stars hit the Earth, but they cannot be sure receivable to the miss of evidence on the matter. The segment, atomic number 77, plays a notice enjoyment as vital evidence in these theories. The of import conjecture to the extinction of dinosaurs is called the Alvarez guessing, first created by Luis and Walter Alvarez in 1980. This hypothesis states that the ken extinction of life on Earth cardinal million years ago was due to one sorry meteor colliding with the Earth. The team of scientists, led by Walter Alvarez and his son Luis, went to the Yucatan Peninsula, where deduction of a giant meteor strike is present. When the team arrived, they find a large abundance of iridium located in the rock, discipline at the K-T boundary.
This is significant because the K-T boundary was created right at the time when scientists believe the meteor hit the Earth. The 77th element on the bimestrial table, atomic number 77 is a rattling hard, silver, brittle member of the renewal metals. iridium is one of the rarest elements in the Earths crust, and sav e has two stable isotopes. Iridium is ofte! n mistaken for platinum, however, Iridium is much more acid and dense. Due to its extremely uplifted melting point, iridium is actually hard to work with. Iridium is thought to be an extra-terrestrial element due to its high parsimony in meteorites. One surmise says that when Earth was forming in its resolve stage, many meteorites hit the Earth, convey Iridium with theIf you want to render a full essay, revision it on our website: OrderCustomPaper.com
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