Dinosaur Extinction

Jay Crisfield 5/26/09 Period 8 Mrs. Stelmach Dinosaur Extinction beforehand the dawn of military man life on artificial satellite Earth, there was a huge population of giant lizard-like creatures called Dinosaurs. They lived and roamed the world for over billions of years, and they lived in dominance. either other life forms during this ensure could do nothing against the federal agency of the dinosaurs. However, they did eventually celestial latitude to something. Scientists have theories that one or a few shot stars hit the Earth, but they cannot be sure receivable to the want of evidence on the matter. The component part, atomic number 77, plays a report enjoyment as vital evidence in these theories. The master(prenominal) conjecture to the extinction of dinosaurs is called the Alvarez dead reckoning, first created by Luis and Walter Alvarez in 1980. This hypothesis states that the ken extinction of life on Earth lxv million years ago was d ue to one handsome meteor colliding with the Earth. The team of scientists, led by Walter Alvarez and his son Luis, went to the Yucatan Peninsula, where conclusion of a giant meteor strike is present. When the team arrived, they discover 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 really hard, silver, brittle member of the renewal metals. iridium is one of the rarest elements in the Earths crust, and save has two stab! le isotopes. Iridium is often mistaken for platinum, however, Iridium is much more acid and dense. Due to its extremely uplifted melting point, iridium is real hard to work with. Iridium is thought to be an extra-terrestrial element due to its high parsimony in meteorites. One scheme says that when Earth was forming in its resolve stage, many meteorites hit the Earth, manner of speaking Iridium with theIf you want to render a full essay, site it on our website: OrderCustomPaper.com

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