Physical Science Coursework Week 1

Part I . For me , the most grotesque and interesting divisor would be the element iridium (Ir77 . iridium is literally unusual as it is one of the r arest elements to be found in the land s crust . Within the world s crust , thither are less than one pound of atomic number 77 for both cardinal pounds of gold , 10 pounds of platinum and 80 pounds of ash gray or mercury . On the other hand , Iridium is much more abundant in meteors whereas the prevalence of Iridium in the crust is less than 0 .001 ppm , the copiousness of Iridium in meteors is at levels up to 0 .5ppm (Greenwood Earnshaw 1997This disparity in the abundance of iridium has made it a particularly distinguished artifact in the history of our planet . The theory that the prominent deal experimental quenching at the end of the cretaceous era which doomed th e dinosaurs was caused by an asteroid impact was bolstered by the discovery of an iridium abundant disceptation floor .

This rock layer was deposited 65 billion years ago , synonymous to the time of the dinosaur extinction . This unusual iridium rich layer coupled with the abundance of iridium in cosmogenic sources seems to bode that a meteor crashed into the Earth 65 mya which caused the extinction of the dinosaurs , and as a stead effect also distributed a layer of iridium across the Earth s surfacePart II . This could be explained by the differences in mass between the bullet and the foray . The amount of energy compulsory to...If you want to get ! a full essay, order it on our website: OrderCustomPaper.com

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